Dateline. Heres Dennis Murphy with the collector. Reporter if your travels take you to the ozarks in southwestern missouri, that splendid lake country, you maybe have bass or trout fishing on the mind. Or perhaps youre heading to branson to catch a few of the stage shows. But there was no tour guide that would have directed you to this modest home in springfield, missouri, and thats a shame because it was an old curiosity shop well worth seeing. Floor to ceiling collectibles. Valuable stuff eye landed. But still every object just so. Think neat hoarders. Anything from coins to arrowheads to he had probably 10,000 to 15,000 books. Hes big into gold and silver, gems. Bayonets from world war i and just, all kinds of stuff that he, you know, a leg cannon. Reporter but did these collectors who had such a knack for finding treasure have a less discerning eye when it came to sizing up people . The dreadful toll in that house that evening . I said, hes off in some way. I dont know. He could be a psychopath or something. I said it scares me. Reporter on april 30, 2014, did they fall prey to someone they believed could be trusted . I had to be lowered to the ground. And i started crying and screaming. Oh, not those oh, such good people. Why . Reporter springfield, missouri, is called the queen of the ozarks, a churchgoing, neighborly city of midsize with good colleges. Gary tyrrell grew up poor on a farm not far away and knew early on that his adult life would be all about education, teaching kids in his classrooms by day, the history book in his lap at night. He and his wife jan raised two jan kept the house mainly and sold Avon Products part time. They lived and gardened in the same house for almost 25 years. They even designed it themselves. Life in missouri was good for the two. They loved each other very much. Reporter daughter jessica remembers how extraordinarily close her parents were, joined at the hip. If my mom went shopping, my dad took her. They gardened together. Talked on the phone, you know, several times a day if they were apart. They really d for the ages, huh . Yes, yes. Reporter personalities . Gary was the fun, outgoing one. He was a very jolly man. You know, kind of like a santa claus. Reporter jan, a little more reserved. It took a little bit more to get to know her. And then once she warmed up to you, she was very alive. Reporter when gary retired as a beloved assistant School Superintendent, he suddenly had all the time in the world to visit civil war battlefields, his antique dealers catalogs. But there was a lucrative sideline to his obsession for memorabilia. And he was big into buying and selling gold and silver. Reporter garys brother, larry tyrrell. He constantly collected coins and bought gold and silver trinkets. Reporter and did pretty well at it . He did very well at it. Gary was a good businessman. Reporter the gold and silver went into one of five safes in the house. But the coins and artifacts, many of them museum quality, were out on display. A lot of indian jewelry that was very quality pieces that he loved. Reporter what was his most unusual piece, do you think . Probably be the walrus tusks that he owned. He had three of those. Reporter they were rare 19th century hand engraved scrimshaw. And each worth around 10,000. So how would he find these things . Im not really sure. They did go to flea markets and garage sales and things like that, but any time i would ask him, you know, where did you get he would say, oh, in my travels. Reporter in 2013, jason murray, became one of the family when he and jessica got engaged. He remembers the walrus tusks as well as all the other unusual items in the tyrrell home. It was one of those things where like there was so much stuff in the house and yet it was immaculate. Everything had a place. And he had so much stuff, it was like an offbeat museum. Reporter jessica and jason lived almost 300 miles away in oklahoma city. But jessica spoke with or texted her parents several times y. But that all changed on may 1st. I had called my mom on my way to work, like i always do. And she didnt answer. So i thought, well, maybe shes in the bathroom. Maybe shes outside. And i called back, and i still didnt reach her. Reporter by noon, jessica says she still couldnt reach her. So she called the Springfield Police and asked them to go by the house. And when the officer did that, what did he report back to you . That nothing seemed out of place. They couldnt see anything secure. Absolutely no signs of forced entry or that anything appeared to be out of place. Reporter the officer had no cause to force his way into the house and left. But jessica says she was still worried. So she and jason jumped in their car to make the fivehour drive to springfield. They arrived at the house around 7 00 p. M. As we were coming around the corner to the house, i hit the garage door button. And both of their cars were in reporter and that was bad news for you . Yes. Reporter what did that imply . That there was something terribly wrong. Reporter jessica called 911, without ever going past the garage into the house. Two officers arrived within minutes. They entered the home. And then another officer arrived and then another and then another and then another. Reporter and youre waiting outside . And were waiting outside. To jessica and jason. And then, they noticed police blocking off the area with crime scene tape. I kind of grabbed on to the officer and i said, what is going on . Why are they calling for crime scene tape . And he kind of, you know, held me and said, i dont know whats going on. All i know is there are two people in the house that are deceased. Chilling words outside the tyrrells house. But they were nothing compared to what inst inside. 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They didnt identify them, but jessica says she knew it could only be her mom and dad. And i started crying and screaming because i knew it was it was my worst fear. Reporter her fiance, jason, was by her side, trying to console her. She was beyond upset. She kept saying, im sorry, mom. Im sorry mom. I had no details. Im thinking this is horrible and also hoping its carbon monoxide. Reporter not benign but something explainable. Right, right. Reporter but inside officers quickly grasped the cold stomachchurning truth. Jan and garys deaths were not accidental. It was going to be a long investigation. Reporter detective neil mcamuss was one of the first detectives on the scene. That night he entered the home through the garage and saw gary first. We could see that there was a deceased male in the hallway of the home. Reporter his pants were what did you make of that . We didnt know. The only thing that we could think of was hes trying to get away from somebody, that theyre grabbing hold of him. Reporter or was the killer rifling his pockets for something . A key, maybe . A combination . In garys office downstairs, the detective saw jan. She was on the ground. She was lying face down. But it was obviously that there was severe trauma to the back of her head. Violent Home Invasion . Jan and gary had more than a half a Million Dollars worth of valuables in the house there for the grabbing, so a botched robbery was a likely scenario. And in the garage, police did find strange marks and scratches on a tornado shelter that was also used as a safe. It appeared that somebody had tried to pry the lock open. There were some marks that were by the lock on the door of the tornado shelter. Reporter they didnt get inside. Did, no. Reporter but that would suggest somebodys looking for something. Yes. Reporter but if robbery was the plan, the killer had left the oddball museum strangely intact. Nothing appeared tossed or out of place. And the nature of the killings gary was shot as well as beaten spoke volumes to the prosecutor assigned to the case, todd myers. It seems to be an element of personal anger in this thing, todd. This close quarter killing of somebody with a weapon in your hand. Yes, it definitely seemed to reporter investigators determined jan and gary were likely killed the night before. But search as they might for the murder weapons, the gun and the bludgeoning instrument, officers came up empty handed. But they did recover some unusual evidence. Around jans body there were small white flakes of a substance that were obviously either from the murder weapon or on the murderers body. There were similar flakes found reporter so they bagged them and sent them off for testing. And the crime scene techs recovered Something Else that could be a crucial piece of evidence, a discarded latex glove. So a latex glove on the floor jumped out at you. Totally out of place. And from talking with everybody, that there is no way that gary or jan would have left that glove there. It was right in the middle of the floor for everybody to see. Reporter did it belong to the victims or the killer . No one knew. You dont know what it means. We dont know what it means. And it was collected. Sent to the Highway Patrol crime lab. Reporter they had no idea, no working theory yet of why the couple had been murdered. But they did have a sequence that made sense as to the order of deaths. It is hard to believe that gary is shot upstairs if jan is still fully functioning and mobile that she would not have called 911, would not have tried to intervene in some way. Speculation but common sense tells you shes the first victim. Shes the first victim. Yes. Reporter shes bludgeoned to death downstairs, gary arrives at some point later. Most likely he arrives either while that is ongoing or the killer is waiting for them. But yes, it appears that she would have been the first to have died. Reporter a big question early on for detectives was understanding their crime scene. How did the killer gain entry to the house . There were no signs of forced entry. Reporter windows havent been forced. The doors are all intact. Killer could have gotten in. One would be to have their own access device, whether its a key, a garage door opener, some way that would open the doors up. And then upon leaving, be able to lock it that way. Or, to have been let into the house by either gary or jan. Reporter it didnt appear to the cops to be a random Home Invasion but rather that the killer or killers had been someone the couple knew. Was it a person gary encountered in his antiquing travels . Or, terrible to think about it, was the perpetrator someone much closer to home . Was this all in the family . I was shocked. Really confused and baffled. Coming up who had a motive to kill the tyrrells . Investigators have at least one idea. Shes the person who could benefit here from this crime in terms of getting money. Shes the only child from parents that are very welltodo with a lot thats going to be left to her. Create your own tour of italy is back starting at 12. 99, only at olive garden. To get everything you want, all on one plate. Plus unlimited salad and breadsticks. Because the best tour of italy is the one you create. Olive garden. The enamel on my teeth was weakening. The whiteness wasnt there as much, my teeth didnt look as healthy as others. My dentist said that pronamel would help protect my teeth. Pronamel is giving me the confidence to know that im doing the right thing fios is not cable. Were wired differently. So we wired the wagners house with 100 meg internet. 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Jan and gary tyrrells modest home was filled with valuable items. And yet at first glance nothing appeared to have been taken. An early supposition was their killer was likely someone close to them. And no one was closer than daughter jessica. She is the person who could she had the most to gain. Shes the only child who has parents that are very welltodo with a lot thats going to be left to her. Reporter so shes going to be questioned hard . Yes. Reporter so that night, detectives asked jessica and fiance jason down to the station to answer a few questions. The cops didnt let on they were talking to them not just as grieving relatives but also as potential suspects. Im obviously going to take a few notes, obviously, as were so dont let that bother you. Reporter the interviewer withheld details about the crime scene. A standard investigative tactic to see if a subject knows more than they should. He even threw out a theory that wasnt true murder suicide. One of the things we have to look at is as to whether or not that one of them wouldve injured the other and then maybe themselves. Reporter jessica seemed to go with it. Do you think thats a possibility . Made comments. And my mom called the doctors office, and i told her if he did if he said something stupid before again, that she needed to call the police. Like get the [ bleep ] away from him and call the police. Reporter and as they continued talking, police had another reason to be suspicious of the daughter. Shed driven five hours to check on her parents then didnt go inside the house. Wouldnt you wonder why she would do that . Yes. People sometimes that commit a crime or know a crime thats been committed, you dont want to see the bodies in there so they call somebody else. Reporter detectives pressed the couple about their movements that day, what they did or did not do at the scene. Had they tampered with that tornado shelter in the garage. You guys didnt do anything to try to get inside . Oh, no, no, no, no. I mean i pushed my hand on the handle, it was locked and that was it. Reporter did you think that maybe are we looking at a situation here where we have to call a lawyer or be careful about what we say . I did, a little bit. Reporter but neither jason and offered the detective more detail about what was in that tornado shelter that had been tampered with. The safe room was full of gold, and silver, and gold bars and i dont even know we actually dont know what alls in there. I mean he has books that are signed by president s. He has indian peace medals. Reporter for investigators, the entire interview was a test. How are you going to hold up . Are you going to give answers that we can go back and verify . Yes that was the detectives intent to the degree of just trying to make sure we get the truth. Reporter did they pass the tests . Detectives let them go but held on to jessicas car to test it for potential evidence. Why did they have reason to look in your car . I didnt really know. I assumed it was just because my car was there. Reporter now jessica had to call family and friends to tell them the news about her parents. Her uncle larry, her fathers brother, was at his law office gone. I said, what do you mean . Are they out of town . No, theyre deceased. I collapsed on the floor. Reporter you were a mess. I was a mess. The unknown was terrifying. Because i didnt know what had happened. Reporter but larry wasnt shocked or outraged to learn his niece was being looked at as a potential suspect. He was, after all, a criminal defense attorney and former prosecutor. I knew she had to be eliminated. Due to the fact that she was the only child. She just had to be eliminated so that the case could move on. Reporter and the case did keep moving. But after a full week of investigating the daughter and fiance were not eliminated. Rather, detectives called them back to the station, this time interviewed separately. Jason first. Cops by now had figured out that the murders took place the night before the bodies were discovered. We went to the pizza hut up on i dont know, probably 5 30 or Something Like that and came back home and stayed home. Reporter home five hours away in oklahoma city. You remember how you paid for the pizza hut . On my credit card. Reporter then right to the point. You have any reason to want to harm gary or jan . Did go into the house. Everything yel absolutely. Reporter next jessica was in the chair answering questions about her relationship with her parents. Are they paying any of your bills . They pay my at t bill for my cell phone. Pay my car insurance. And i think thats it. Reporter im just going to ask. Did you have any ill feelings towards your folks . Anything that you would have been mad at them for, any reason to want to harm them or anything my parents were my life. Reporter so better your financial situation or anything like that . No. I mean, if i needed something, all i had to do was call and ask. Reporter so youre a suspect. Right. Reporter in y