Abandoned mansion, eerie. Haunting. Where was this killer hiding . Cold, calculating eyes, lifeless. He was almost a ghost. Could they catch him . Could they stop him . I get chills all over. Im kind of on the edge of my seat. He truly thought he could outsmart us. Im lester holt, and this is dateline. Heres Dennis Murphy with the unusual suspect. Reporter consider for a moment the cozy word home, and all it evokes. Warmth. Family, shelter. Security. Got it . And now reflect on what happens when those four walls are breached, when nightmare stuff crawls through the window, kicks in the doors. When a haven becomes a house of horrors. So how does that feel . Just ask lloyd irvin. Im laying on the couch. I wake up and theres two gunmen pointing them at me, like, holding down. Youre being robbed. Dont move. Reporter many years have passed since that night in august 2008, here outside the Nations Capital in a nice neighborhood in Prince Georges County, maryland, but lloyd and his wife vicki and their son, just 4 yearsold at the time, are still haunted by the image of the gun men. Two masked intruders. Talk about your worst nightmares. This is it. Yes, its something you would never imagine would happen. Is a nationally renowned martial arts expert. And when one of the gunmen walked away to scope out the rest of the house, lloyd was suddenly oneonone with his accomplice. Gunmans over here in the corner, huh . Right in the corner right there. I know he doesnt have any room to back up at all. I just go. Im coming over here. And i got the gun. Im trying to get the cartridge out. And once i get the cartridge out, i it drops. So i hit the ground. Wheres the intruder going . He ran out the room. He was running low like, he has managed to reload the wrestledaway gun and give chase, both Home Invaders had escaped. And im calling 911. And my sons on top of me. And hes just shaking, not saying a word, not crying. Just shaking. And i often think, you know, were they going to kill us that night . Reporter the irvin family wouldnt be the first, or the last, to ask that awful question. Id like to report a robbery, armed robbery. And they had a gun. I see the back window. Reporter in the months that followed, the area was hit with a wave of Home Invasions. Each time two masked men, meticulous about not leaving fingerprints or evidence behind. The Prince Georges County police were baffled. The community, understandably on edge. And then, on january 26, 2009, on a quiet street in upper marlboro, the county seat anxiety turned to fullon, boltthedoors, panic. Prince georges county maam, ive been shot. Me and my mother have been shot. Im bleeding to death. Where are you . Reporter it was a desperate plea for help from a dying girl. On the phone, 16year old student, karissa lofton. Sweetie, slow down. Whats the address . Reporter Police Rushed to the scene, but it was too late. They found karissa and her mom, karen in their bedrooms. Each killed executionstyle with statistics. But this just stands out, doesnt it . It stands out. It makes the hair on the back of your neck stand up, also. Reporter veteran Prince Georges County homicide detective Bernie Nelson was in charge of the case. The First Arriving officers told him theyd found the main door locked shut from the inside. The killer, they thought, had likely entered the house through an unlocked side window. This bedroom on the second floor thats facing us, thats where karissa was found. Anything to do with the plague of recent Home Invasion robberies . If so, why was nothing stolen from the house . Her vehicle was still in the driveway. Nothing appeared disturbed. Reporter investigators didnt find any useful forensic evidence. Just six spent shell casings from the bullets that had killed karen and karissa, fired from a glock 17 handgun. We did find out that just two doors down across the street, someone had seen a blue vehicle parked right down on the right side of the road. And that, right now, at this point, thats all i have. Reporter so detective nelson set out to find out more about his victims. Karen lofton turned out to be a devoted mother and nurse with no apparent enemies. She was divorced from karissas father, kirkland, who now lived in atlanta. The daughter, karissa, was in private school. Good grades and still very attached to her father. Karissa was always a special girl for me because at a young reporter kirkland says he had watched karissa blossom into a gregarious teenager, a fashionista and aspiring model with a knack for selfies. I sing this song by bob carlysle called butterfly kisses. It told the story of him and a daughter. And i used to sing that song to her. And she would just look up at me and she loved me singing that song to her. What i called her. Reporter now kirklands butterfly was dead, and detective nelson recruited some of Prince George countys finest to help him solve the case, including detective anthony schartner. This is a mother, hardworking, and her daughter. You know, both think that theyre safely inside their home. And here comes the guy out of your worst dreams. Yep. Here comes a monster into your house. And hes got a glock. It shocked us all. Reporter as the hunt for this brutal killer went into full gear, detectives started as since there is no rhyme or reason behind it that you can come up with, you have to look at Family Members. Reporter and one Family Member in particular, karissas 20yearold brother, kion. He lived in the house, too, but he wasnt there when cops arrived. Police spotted him near the crime scene several hours after the murders. Could a son, a brother, have done such a monstrous thing . When we come back, the question begins. Would you hurt your mother and sister . One of the detectives blatantly said everybody thinks it is you. Was it . Reporter a mother and her daughter, executed. Detective Bernie Nelson had investigated hundreds of murders. Had learned to keep the recurring images of death at arms length. But this case was different, he was a father to a teenager around karissa loftons age. Maam, ive been shot. Me and my mother have been st. Im bleeding to death. That poor little girl in her bedroom. She has the gumption to get on the phone and call you. It hurts to listen to the 911 call because you can feel and hear the fear in her voice. Reporter even though nothing was taken, it seemed clear that the killer broke into the house. In fact, the Burglar Alarm had gone off, but it was disabled in under a minute. And that put karens son, kion lofton, at the top of polices personofinterest list. He knew the code. Police found brought him in for questioning. Does your mom set the alarm for the house . Mmhmm. Okay, all the time . Every day. Every time. One of the detectives, blatantly said, you know, everybody in that room thinks its you. You are the only one who had access to the pin code. Would you have hurt your mom or sister . No. You would never hurt your mom or sister . Not at all. And at that point, you know, i was upset, you know, i didnt haveny know. You can do whatever you need to do. Its not going to be me. Reporter kion told investigators hed been spending the night at his fiancees house, when her mom woke him up and told him shed heard on the news that two women on his street had been murdered. I just ran out the house. My hearts racing. I dont even open the gate. I just hop the gate, hop in my car. Im just im running lights. Im speeding. Me for my name. And i was, like, im kion. And the Police Officer just turned his head. And he kind of looked into his radio and said, okay, we got the son here. And i just broke down, you know. Reporter kions alibi checked out. It wasnt him. Investigators also interviewed kirkland, karens exhusband, and karissas father. He too had an airtight alibi. Hed been in atlanta at the time of the murders. Next on detective nelsons list was karens former boyfriend, michael lacey. Hed refused to take a lie detector test, so detective nelson interviewed him three separate times. Yall have keys to each others house . You couldnt go over and walk in . We would call. Hes someone that we had to rule out completely, and we did that. So if youre thinking in your line of work, the usual suspects, the usual suspects werent going to figure in this one. Not the immediate family. Reporter detectives nelson and schartner realized they had on their hands what homicide cops hate, a true mystery. The first 48 hours of a case. Usually, you get a break. Chase this, right . Yes. Normally you would get something in the first 48 hours. So this is as baffling as it is cruel . Exactly. It didnt make any sense. Reporter then came march 16, 2009, six weeks after the lofton killings, when two unsolved murders became four. It began with a report of a stolen Nissan Maxima just a couple of blocks from where the loftons had been killed. Whats the nature of your emergency . I just left my house about an hour ago and came back. My car is missing out of the car port. Reporter detective schartner was on call that night. Shes on the phone with the 911 calltaker, she notices that her car comes zooming by from up here on the street, and comes by her at a fast rate of speed. Thats my car. Okay, it just zoomed past me. Wow she sees it while shes on the phone with dispatch . Here it comes. There it goes. Absolutely. Reporter police swarmed the neighborhood hoping to nab the discovered the stolen car. Captured here on one of the cruisers cardash cameras, it was parked in the driveway of a vacant house, engulfed in flames. Fire fighters called to the scene to extinguish the fire made a grisly discovery. Two bodies burned beyond recognition. And the victims . Another mother and her teenage daughter. Dental records confirmed the identities of the two female bodies found monday in the trunk of this stolen car. 42yearold Delores Dewitt and her daughter, 19yearold eb she worked at a nursing home. And she loved taking care of the elderly population. I mean, she loved those people. And they loved her. Reporter Patricia Smith remembers her sister delores as a mother and nurse who worked hard to provide a good life for her two daughters, but always saved a little time for herself. She liked to go places. Every year she would treat herself on vacation. She felt like she worked hard, she should play hard. Reporter and ebony . We made everybody laugh. We just make the party live and just act crazy until the end of the day. I mean, she she loved life. Reporter the last person known to have seen ebony alive was her boyfriend. He told detectives that the previous night theyd had a late dinner. She was wearing her favorite blue sweater. Then he drove her home, watched her go inside her house. The killer may have been waiting. And now, when police once again made no arrests within 48 hours of the murders, waiting, too, was a devastated patricia. I started going back to my sisters house. Late at night, i would go and sit in the yard just hoping that he would come back. And i would sit there with the knife in my hand. And i will hold i will hold it like real tight just in case he came up on me or something. cause it would be him or me. Either him or me. And i told the detectives what i did. She couldnt sit still and do investigation from day one. She would actually go door to door in the neighborhood and talk to neighbors, try to ask them questions. But i had to repeatedly explain to her that we cant have her interrupting our case. Shes a thorn in your side. She is. But i understood because if my sister were killed, it web for me to sit still too. Reporter so detective schartner made patricia a promise. We were sitting in the car. And i remember just crying and crying and crying. And then he promised me, he said, im gonna get him. He said, if its the last thing i do, im gonna get him. To do that, detectives schartner and nelson had to confront a terrifying question. You got two murdered motherdaughters within, across the fence, virtually. Right. Same neighborhood. So youre thinking, are these things related . Right . You have to think that. And if they are related, you and you dont know when hes going to hit next. And you dont know who hes going to hit next. Coming up. The fear that spread was absolutely amazing. A neighborhood on edge. Police under pressure, and the question everyone feared. Would there be another victim . It was wide open. We had nothing. Thats when it gets scary. Reporter Prince Georges homicide detectives, Bernie Nelson and Tony Schartner, hoped their collective experience would help crack two of the most horrific murder cases theyd ever encountered. When you back up and look at what you got, the scary fact is somebodys killing mothers and daughters, right . Thats the commonality . Yes. And with the close proximity of where the dewitts were found burned in the vehicle, it was just two blocks away from where the loftons were shot in their house. Suspected they were dealing with the same murderer in both cases, especially when they realized Delores Dewitt was a single mom and a nurse, just like karen lofton. But first, they exhausted the usual suspects. Delores had an exhusband and an exgirlfriend, but both had solid alibis. We had given them polygraph tests. They passed. We did background checks on them. We found out where they were. And there was nothing that would lead us to say that they were reporter as in the lofton case, when detectives searched the dewitts home, they found no sign of a forced entry, just an unlocked sidewindow. And inside the house, once again, no forensic evidence. But a different pattern. The killer had taken his victims with him. We dont know if they were killed inside the house and transported away, or if they were just transported away and killed elsewhere. Reporter the burned Nissan Maxima that carried the motherdaughter bodies didnt yield any significant clues either. The fire had destroyed everything but a tiny piece of jeans on delores body. And, attached to the jeans, some leaves foliage experts identified as coming from a beech tree. Odd, because there were no trees like that in the neighborhood. And the mystery only deepened when the autopsy results came back. Ebony and delores were actually killed 24 hours prior to them being burned in the car. That was another hiccup in the case, is where were these two reporter it seemed the dewitts killer took immense risks to get rid of the bodies. Youre talking about taking two women out of their house and transporting them to another location and then stealing a car, putting those dead bodies in the car, driving past the house that you just stole the car from, and then parking it in a driveway of a vacant house, then setting that car on fire and walking away. Reporter and theop ebony were strangled, not shot as the loftons had been. It was a puzzle. Were they dealing with a serial killer or not . Did you think one guy was responsible for both these crimes . I would go back and forth. One day i would it was all in that this is the same person. The next day, i thought it wasnt. Because both crimes are so different. Reporter then, finally, the detectives caught a break. They learned that a month before the dewitt murders, the owner of the stolen Nissan Maxima had she reported it, but, at the time, told Police Nothing had been taken. Now she noticed there was her spare set of car keys was missing. So, tony, as i understand, your detectives logic goes Something Like this. If i can find the person who broke in, who stole the key, who then used the vehicle to transport the bodies, im getting close to my killer. Exactly. It certainly would give me a direction where maybe that person then can direct me to the killer. Reporter 200 Police Officers blanketed the area and brought in more than 80 people for questioning to no avail. For many Prince Georges County residents like Home Invasion victims vicki and lloyd irvin, that meant only one thing, panic. It was crazy. I couldnt sleep at night. Any sound. I had alarms put up throughout the entire house and plus, we got the dog, so and bars on the windows. Yes. The house was turned into fort knox. A barking crazy dog who claws at the windows if he hears a door bell ring. I mean, there was no peace in the house. I cant live like this because hes like, i dont care if this is going to save our life, you know . Just the fear that spread was absolutely amazing. Reporter by july 2009, four months after the dewitt murders and six months after the lofton murders, detectives were stumped. Kirkland lofton grew increasingly frustrated. I mean, when the dewitts got murdered, they went to karen and karissas house and they started combing the back fields and everything, looking for evidence then. So i think that the inig because they were so sure that the usual suspects were the suspects. We kept calling them and they werent giving us any answers. So that kind of pissed me off. Because i felt like we deserved to know something. It was wide open. We had nothing. Youre out of your investigative playbook. And then thats when it gets scary. Reporter the detective had made a promise to patricia that he would take down her sisters killer. Would that turn out to be an was luck. And luck was about to come his way from the most unexpected source. Coming up. He would only whisper. He would whisper in my ear. An unassuming neighbor comes forward with some unbelievable information. At that point we realized that our investigation just took reporter Prince Georges County detectives Tony Schartner and Bernie Nelson theorized the home burglar who stole a spare key to a Nissan Maxima might lead them to a serial killer. But how to find him . We chased down all those leads, and it took us, you know, several weeks, and we came up with nothing. Reporter then, in july 2009, schartner got an unexpected tip. Federal agents from the a. T. F, the bureau of alcohol, tobacco and firearms, had arrested two men for selling stolen weapons. They suspected one of them had been also involved in several burglaries in the area. His name was jason scott. Jason scott lived two, three blocks away from the dewitts house. So obviously thats somebody the subject, who was quick to deny he had anything to do with any of the burglaries, looked to schartner like a pipsqueak. He was a small guy. He was meek. His voice was very low. He wouldnt speak to me as you and i are speaking. He would only whisper. He would actually come up and actually whisper in my ear. Did you think, tony, that point, i got a suspect here . No. Reporter a. T. F agents john cooney and dave cheplak led the federal investigation into the having a tough time trying to read jason scott. Usually were pursuing the most violent criminals in the united states. For lack of a better word, you know, this guy wasnt a thug. Reporter in fact, jason turned out to be a College Graduate and a valued employee at u. P. S. We did a background check on him. And really, he had no criminal history. Jason and his accomplice were charged with weapons theft and possession, but given that trial. She had to basically make a decision, all right, youre not a flight risk and youre not a danger to the community. So both were released to home monitoring. So they could come and go. Court is telling them go and sin no more, dont be stupid, dont be a bad guy. Yes. Reporter but the a. T. F agents werent about to let jason scott walk away quite so easily. They suspected that he had several other coconspirators in the weapons theft and instinct suggested he might be the type of petty criminal happy to throw others under the bus in exchange for a lenient deal. So the feds offered him whats called a proffer session. Sometimes called king for a day, or in monopoly, a getoutofjail free card. Its an agreement between the prosecutor and suspect that essentially says, tell us everything you know, and well go easy on you. And the stuff that i spilled out, you will not come after me . Thats the agreement . If we cant prove that any other way besides him telling us, then theres nothing you can do. You cant use his statements against him when that statement session. Reporter agents cheplak and cooney had been on the job for a long time. But what happened next stunned even them. So we come into the room to conduct a proffer session with jason scott. Myself and dave cheplak are on this side of the table. Jason and his defense attorney are sitting across from us. We see that jason has three pieces of paper in front of him on the table, which he passes across to dave and i. Dave and i take a look at the papers and see about 40 different addresses. Suddenly, jason admits to breaking into all these houses. Not onlyt, houses he tells us he breaks into, wakes people up, points guns at their heads and robs of them of their valuables. At that point, we realized that were not just dealing with a guy selling and stealing guns. Our investigation just took a drastic turn. Reporter jason had rocked the federal agents off their script. The kingforaday deal was about copping to the firearms charge and here he was telling them instead that he and his accomplice Marcus Hunter made a living by pointing guns at so many peoples heads, including invasion of the irvin family. But hes cut his deal, john. You cant go after him on those burglaries. The Home Invasions. At that point youre correct. Hes home . Hes off scotfree. Home free. Reporter even better for jason, he believed his accomplice, Marcus Hunter alone would be left to take the fall for their crime spree. He figures if im the one whos willing to testify against marcus, thatll be his opportunity to lessen his sentence. Cunning. How good was this guy . He certainly had a plan and he had an idea of what he was trying to get away with. It really was a real life cat and mouse game for him. Reporter back at the county, detective schartner was floored when he heard from a colleague that the pipsqueak hed interviewed and dismissed the week before, had fessedup to a majority of the unsolved Home Invasions and burglaries in those wellto do neighborhoods of Prince Georges County, including one his colleague had been investigating. You. You got your case closed out. But im still here with four dead women that we havent solved. And i said, hey, just out of curiosity, can you give me that list . Reporter when the detective plotted the addresses jason had pushed across the table on a map, he couldnt believe the picture that emerged. This an ahha moment in your investigation . This is our ahha moment. This is our first break in the case. Coming up. We dont know if we have our guy, but we certainly have some the investigation was about to lead them here, something called the spooky house. And a federal officer on this case would soon be spooked himself. Actually, grabbed my gun and proceeded to tactically clear my listening to music in the shower can help you conserve water, so start your Favorite Song when you get in, and when its done, times up. Youve probably conserved at least ten gallons of water. Saving the environment never sounded so great. This is ground zero. This is where i responded to, was this location, and this is where the dewitts were found. Reporter thinking hed made the deal of a lifetime, mild, meek jason scott had confessed to a wave of Home Invasions and burglaries in Prince Georges County, maryland. But by doing so, he had unwittingly provided homicide investigators with the first real lead in the lofton and dewitt murder investigations. Up here as you continue to go up . What are the other dots . Admitted to breaking into the houses here on woodlawn. Reporter and here is what the detective found strange. Jason had admitted to every unsolved burglary on the block. All but one, the house from where the nissan spare keys were stolen. For me, the most important part of this puzzle was to find out who broke into this house right here where the vehicle keys were stolen. In the interrogation, he did not give you that address. He did not. Reporter an anomaly, schartner wondered, or did jason know just how important the car keys were and deliberately keep we dont see guys that break into houses and steal a tv then morph into a serial killer. We dont know if we have our guy. But we certainly have now something to investigate. Reporter detectives schartner and nelson teamed up with atf agents cheplak and cooney to create a task force to solve the riddle of jason scott. When you guys talk to friends and family, trying to figure out who he was, did anybody tell you he was a nice guy . To say about him. As a matter of fact, most people knew nothing about him. He was almost a ghost. Reporter a ghost indeed. When investigators examined items seized at jasons home, they found this. Disturbing videos he apparently shot as he snuck around the neighborhood. Turns out jason scott was as scary a peeping tom as investigators had ever seen. Someone walking woods videotaping people through their homes in various states of dress and undress. Getting ready for work or getting ready to go to bed. This is deeply creepy stuff. Absolutely. Reporter the person who knew him best was Marcus Hunter, the accomplice first arrested with jason scott. But marcus wasnt talking. Investigators wondered, was he afraid of jason . Another former coconspirator was telling investigators jason was no one to cross. Him. These guys would say, if i ever got into a fight with jason, jason, you know, wouldnt fight me back. But two weeks later, hed be the type of guy to come back and burn my house down. Thats the type of dude he was, hes crazy. Reporter three weeks after his kingforaday deal, jason scott was still walking the streets. Investigators knew enough about him to worry for their own safety. His m. O. Was, he would specifically go and cut the power to these homes, cut the alarm lines, so one night sleeping and i kind of become aware that all of a sudden the power is off in my house. So knowing that jason knew my name and thinking he could figure out where i lived, i actually grabbed my gun and proceeded to tactically clear my house. Just to make sure that he wasnt the reason for the power being out. As i worked my way through the house and into the kitchen, i finally come up and i notice at that point, i take a sigh of relief and i realize its not him. But thats how concerned i was. Hes that dangerous a guy that i recognized he needed to be in jail. Reporter if jason scott was smart, the taskforce simply had to be smarter. And investigators noticed jason didnt seem to understand an important legal nuance. His proffer didnt guarantee him complete immunity. The cops could not use his own words against him, but they could use the words of others. Other accomplice of jason, they grilled him. Do you know of him to break into a house and just take car keys . Yeah, he talked about one job, a couple of jobs hed going in and take the keys and just have just in case he needed the car. Reporter these details eerily mirrored what happened in the dewitt murders. He likes to steal car keys, spare keys. And he likes to come back later and get that car. That was exactly the case with the nissan, right . He liked to park cars in vacant houses, preferably houses that were for sale. Again, the torched car with the bodies was a vacant house that was for sale. Reporter detective nelson nailed down several connections between jason scott and the first motherdaughter murder, the loftons. Most important of those, jasons car, a dark blue toyota camry. It matched the description of the mysterious car one of the lofton neighbors had seen. That could very well have been the vehicle that the neighbor had seen the night of the killing. Yes. Reporter then, investigators piece of evidence, a video jason made of the victims of one of his Home Invasions. A mother and her teenage daughter. He brought her into her bedroom and set up a video camera. And in the process of setting up that video camera, in which he was going to, basically, film himself sexually assaulting her. That camera happened to pan right by his face and that screen shot showed us this. Wow. This is what a lot of jasons lifeless. Reporter investigators were shocked, even more so when they dug up the old Police Report and noticed what the perpetrator they now knew to be jason had blurted out to the mother and daughter just before he left. Okay. Here it is. He said he didnt want to hurt us, but he said he was supposed to kill us. Reporter yet all this evidence was purely circumstantial, not enough to charge, let alone convict jason of murder. But that was about to change. And it had to do with the one case police had plenty of evidence for, the weapons theft. When federal agents questioned jason about it, he mentioned the spooky house, an abandoned building somewhere off the beaten path in upper marlboro, he said, where he and his accomplices went to split up the loot. Detective schartner had a spooky feeling hed brought more than guns. The place or house or wherever where the dewitts were stored or kept for those 20someodd hours. So the spooky house, whatever it is, could be the place . Absolutely. Reporter and according to jasons proffer, if his statements led to new evidence, that evidence could be used to prosecute him. My first thought and impressions were that this is going be, like, a old, rickety house, maybe falling apart. It doesnt feel like were heading to spooky house, guys. And it wasnt until we came here that we realized there was a long driveway here that maybe made sense. There it is, ahh . Reporter the spooky house was a georgian mansion, up for sale, and like the property where the nissan was set on fire, vacant. What a hideaway to do whatever you want to do away from prying eyes, huh . Absolutely. And at night, this is absolutely pitch dark. This is just a playground that reporter the task force called in the forensic team. We walked down here through these rocks here, and thats when i first initially saw the sweater, which was actually right down here in the rocks. Reporter it was the charred remains of a blue sweater, the kind ebony dewitt had worn the last time shed been seen alive. And once we saw that, we said, hey, this is it. This is finally something. And youre talking about a high five moment . We looked a bit further, and and then scattered within these leaves over here were, were the jean pieces. Reporter jeans that seemed to match the jean fragments recovered from Delores Dewitts body. Leaves covered the ground and the task force wondered whether they were beech tree leaves, the type that were found attached to deloress jeans. Detective schartner brought an expert to the spooky house to identify the foliage. And he pulled up here, and he said, this is the jackpot of poor ebony and her mom were here. No question. Without a doubt. Reporter but to arrest jason, investigators needed more. In the meantime theyd eliminated his accomplice as a murder suspect so they hit him up again hinting, jason is talking, and if you dont, youll be the one to take the fall. That did it, Marcus Hunter finally agreed to cooperate. And right away, he dropped a bombshell about jason. The specter of him becoming a monster, it grows with each and every stone that we overturn. I think he truly thought he could outsmart us. Could he . What would it take to put jason scott behind bars . And. Let me tell you something that will probably freak you out. One more chilling revelation for the irvin family. Reporter almost six weeks after jason scott walked out of the Prosecutors Office with a potential stayoutofjail deal in hand, the task force persuaded jasons accomplice, Marcus Hunter to cooperate. The king for a day was about to be dethroned. So marcus tells us that about a month prior to the dewitts being killed, that he and jason and jason stops and looks into the dewitts house and he notices ebony and he starts to stare. And marcus gets uncomfortable and says, hey, we cant stay here all night. You need to go. Reporter much more damaging, the accomplice told the taskforce that after yet another robbery, and approximately an hour before delores and ebony were killed, he had given jason a ride to his car, parked just a block or so from the dewitts. Ane he said that there was at one point, and it was during the time that the loftons were murdered, that he had seen jason scott for a short time frame with a glock 17. Reporter a glock 17, the very weapon used to murder karen and karissa. I had one of our investigators try to find out who purchased glock 17s over the last two years. And then contact those people broken into 13 days before the loftons were killed. And during that break in, their glock 17 handgun was stolen. Reporter and here is were detective nelson got lucky. The state of maryland requires handguns to be test fired before they are sold so it can archive each guns shell casings to help identify or trace the weapon should it be later used in a crime. Casings and had them compared to that known shell casing from that known handgun. And during that testing, they were able to verify that all six shell casings came from that one particular glock 17. That was the weapon that was used to kill both of my victims. Once we found out exactly where our murder weapon came from that was used to kill the loftons, we needed to find out if jason scott ever had that gun in his hands. Into a house in this one particular neighborhood. He said they did. It was only one. We didnt tell him which one it was. He led us directly to it. The house that the glock was stolen from that killed the loftons. As far as that hand gun goes, i think that was the nail in jasons coffin. We know that he stole that weapon. Did that solve the lofton murders . It got as close as we were going to get. Reporter detectives schartner and nelson arrested jason scott at his home on september 2, 2009. I distinctly remember telling him, jason, take a look at your house, this is the last time youll see it. He didnt even have a response. He just gave some type of noise, smacking smirk. His lips. As if, ill be back. I think he truly thought he could outsmart us. And then fortunately, between bernie and i and the two agents detective a promisekeeper. He said, im going to get him if its the last thing i do. He said, im going to get him. And he got him. Reporter in exchange for his cooperation, Marcus Hunter got a reduced seven year sentence for weapons possession. It would be another three years before the atf and county police analyzed all the evidence against jason scott. When all was said and done, he was sentenced to 185 years in one of the things that the judge said, and ill never forget this, he said, youre not even a crime wave. Youre a tsunami of crime. Satisfaction to take down a guy like this . Extreme. That was the proudest moment in my career. Reporter but jason did cut one final deal. In exchange for acknowledging that prosecutors had enough evidence to convict him for the dewitt murders, the state agreed not to prosecute him for the loftons. And that didnt sit well with the lofton family. They had their doubts about whether all the circumstantial evidence really proved he had pulled the trigger. We wanted a trial in this case because we wanted to see him on the stand, admit what he did and be charged and convicted and sentenced for murder. It wouldve brought answers. It wouldve gave us a reason to stop looking. What do you say to someone like Kirkland Lofton who wants to have their day in court against this guy . I fully understand Kirkland Loftons position and the lofton family. I want them to have their day in court. I went ahead and typed up a statement of charges to charge jason scott. I just couldnt get the blessing from the state Attorneys Office to go forward with it. But you would say to him, jason scott is the killer. I would say to him that jason scott is the killer. He is who took karissa away from him. Him. The bottom line is we know that jason is gone forever. Reporter the serial killer, the master robber and burglar will likely die behind bars. The neighborhoods he terrorized are safe again. But under some roofs theres been damage to that concept of home as a sanctuary. Take vicki and lloyd irvin. Theyve kept their burglar bars, their home alarm system. They didnt know how much they needed that stuff until we filled them in. Let me tell you something thatll probably freak you out. And this comesro he said after the Home Invasion, they came back. Oh. Are you serious . He wanted another round. They parked in front of your place, did a little surveillance, scoped it out. And jason scott wanted to come back in and even the score. Wow. I didnt know that. Thats scary. Could have been your picture on the 11 00 news. Thats right. Like, how does one person cost so much damage and so much hurt and so much loss for so many people . Im lester holt. Thanks for joining us. Right now on news 3 live at 11 aheartbreaking loss, two brothers killed by a dui driver. We will hear from the victims mother. Plus, a man runs for his life and others, how the rock and roll marathon helps those in need. Then wounded lifting experience on their last day in las vegas. News 3 starts right now. On our way to get me a birthday gift. A mother deals with double tragedy, she loses both her son in a drunk driving crash and now she mourns while metro looks for the person who dilled them. Good evening, im gerard, we will get you that story in just