I have young kids. My husband i cant keep putting them at risk. My wife had two guns out. And i said, unless you know its me coming through the door be ready to use them. Reporter the trail that would stretch from coast to coast. Is this some sort of antigovernment Militia Group . I i had no idea what we were dealing with. Reporter before leading investigators back home. My thoughts were, its someone we know. Was he living a double life . I think he was. Youre making him sound like Hannibal Lecter. It was just wow. Reporter the courthouse. The moral center of every American City and town. The place we go to settle differences. Resolve disputes. Find justice. Its the place where the story usually ends. But not this time. Not in rural kaufman, texas, where life is leisurely and no one is a stranger. Oh, my god. Someone just shot someone. Theyre laying on the ground. Just bam, bam, bam. Reporter this time its where the story begins. Somebody was trying to send a message. It was just so bold. Reporter a story that quickly got too big for this texas town and like a prairie fire spread across the nation. We have some new information this morning on the manhunt for a killer who gunned down a District Attorney. May have been involved in the brazen murder of the head of colorados prison system. Good evening, a Rural Community outside of dallas is in shock this Easter Sunday. Reporter in this tale the hunters became the hunted. Thats what was so scary. Was that its not just me anymore. I have young kids. My husband, my family. My wife had two guns out, and i said, unless you know its me coming through the door, be ready to use it. Reporter Shannon Hebert never expected to be in danger when she started the career she always wanted. Practicing law. Why did you want to be a lawyer . Oh, my gosh, in second grade, a judge came to my class and i fell in love with that, and i wanted to be a judge or a lawyer. Reporter her dream came true. I was the first one to go to college in my family, and then of course law school. Reporter by 2008, shannon had passed the bar exam and got her first job as a prosecutor at the kaufman count District Attorneys Office on the second floor of the courthouse in the center of town. I loved the office. The people around me were so knowledgeable. They were almost all from dallas. Reporter one of those lawyers from dallas, mark hasse, was an experienced prosecutor and a guy who lived his job. Did you learn anything from him . Oh, gosh, yes, of course. We would go to mark for almost everything. Reporter thats because mark had prosecuted some of the worst criminals in texas. He was tenacious. He was an intellectual and he was very quick on his feet. Reporter marcus busch is now a trial lawyer with the department of justice. Back in the eighties, he and mark hasse were young guns working in the organized crime section of the dallas das office. Mark was not afraid of taking on a fight. Some of the defendants on some of the cases were were very bad people. And mark had the personality to stand in the breach and prosecute the worst of the worst. Why did mark move out of dallas . He wanted a place where he had some room, so he bought a house on about eight acres and built a barn out there. He just loved being around animals and he loved the space. Reporter besides animals and wideopen spaces, mark had another passion flying. Back in 1995, it almost killed him. Mark did have a bad accident. Mark had a terrible accident. A high flying commemoration of world war iis end, 50 years ago this month. Reporter mark was part of this aerial armada of vintage planes when something went terribly wrong. He believed the engine had failed, and he made a forced landing. Ran off the end of the runway. He survived, but he had a very severe brain injury. Did he decide to fly again at any point . He did. Why do you think he wanted to fly again. He almost died. Its like being thrown from a horse. He wanted to be the person that he was before. He did it. He did. He did, but it took a long, long time. Reporter marks colleagues in the das office admired marks strength to fight through adversity. But they also got a kick out of his weakness his love for sugary snacks. He had a sweet tooth, and he would mostly eat everyones stuff. So, like, we would have weekly prosecutor meetings every monday, and we would get doughnuts for them. And he would always get there first and steal my blueberry doughnut. We both loved that. Reporter in 2011, mark and shannon got a new boss who seemed to fit right in with their office family. The newlyelected District Attorney, Mike Mclelland. My names Mike Mclelland. Im the criminal District Attorney for Kaufman County. Reporter mikes stepdaughter, christina foreman, says he loved the job. I think he really did embrace the role as a leader and he enjoyed the people he worked with. He would talk about, you know, oh, this person did this and i was really proud of them. And, this person did this and i was really proud of them. Everything was new to him. He came in and just took it over. Was he tough . I wouldnt say he was tough on us at all. The greatest thing about him was that he let us do what we do best. Reporter and mike quickly formed a bond with mark hasse the experienced prosecutor and the head of the felony unit. Mark was his best friend in the office. They were very close. Reporter mikes wife, cynthia, fit right in around the office too. She was almost like a den mother. She worked as a nurse, but found time to bake cakes and cookies for the staff. Cynthia was also an avid quilter, who loved making gifts for her husbands coworkers, including shannon now married with two children. She would bring fabrics in to show me, you know, is this gonna match the nursery . And then she quilted it for me. It was just stunning. It was very beautiful. Reporter and thats how it was. A happy, humming office a quiet small town. Until january 31st, 2013 just before 9 am. At that moment, the calm serene morning and the lives of everyone in the das office would be shattered. I heard what i thought to be gunshots. Reporter Police OfficerJason Stastny was a few blocks from the courthouse. He and his partner were investigating a burglary when Something Big caught his attention. It was just a slow and methodical five shots. It was just, bam, bam, bam, bam, bam. And then there was a little pause, i guess youd say, and then three more shots after that. Reporter shannon was inside the courthouse when she heard the sound of sirens. Thats not unusual, because theres a Police Station just a block away. Theres a hospital a few blocks down the street. Reporter that siren was Jason Stastnys squad car. You know, i hollered at my partner. I said, hey, you know, those are gunshots. We need to go. We need to go. So we packed up real quick, hopped in the car. Reporter the car camera was rolling as he and his partner drove toward the gunshots. About halfway over, a dispatcher came across the radio and told us that a man had been shot and gave us the location. Kaufman county 911. Yes, weve got a gentleman on grove street and madison that just got shot. Reporter thats just a block from the courthouse. Shannon noticed that her secretary was looking out the window at some commotion on the street. My secretary turned around and she was crying. Initially, i just wanted to comfort her. I couldnt even imagine what she was crying about and when she turned from the window all she said was, its mark. Reporter mark hasse. Her friend and colleague. And my natural instinct was, did he get hit by a car . And she was, like, no, shannon, he was shot. Who is it . Its mark hasse. Oh, my god, its mark hasse. Hes an assistant District Attorney. Reporter a dedicated prosecutor dearly loved by his colleagues, shot right outside the courthouse. Its nothing you could prepare for. Reporter who would even attempt such a brazen attack . Did that tell you these two knew each other . That seemed very personal to me. A wine fridge now and not a freezer for my leftover christmas gravy . You know, i thought our friends might prefer drinking wine over gravy. Well it is only six months old, i was going to eat that. Check, the freezer, freezer. You check the freezer, freezer. Oh gravy all right. Lets get this chardonnay and gravy party started. Vo with innovative cool select plus go from freezer to fridge with the touch of a button. You odors in your bathrooming you think it smells fine, but your guests smell this. Febreze air effects heavy duty has up to two times the odoreliminating power to remove bathroom odors youve gone noseblind to use febreze air effects till its fresh. And try febreze small spaces. To continuously eliminate up to two times the odors for 30 days febreze small spaces and air effects, two more ways to breathe happy. Daveand starting each day game, with a delicious bowl of heart healthy kelloggs raisin bran. Hows your cereal . Sweet tastes like winning. How would you know what winning tastes like . Invest in your heart health, with kelloggs raisin bran. No crying today. Hows it progressing with the prisoner . Hell tell us everything he knows very shortly, sir. As you were. Where were we . 13 serving 14 service if your boss stops by, you act like youre working. Its what you do. If you want to save fifteen percent or more on car insurance, you switch to geico. Its what you do. Youno, no, no this up she came on to you . I was walking down the street and from the other side, hey hey who is that . She just. She cat called you . No. He was just friends. He was friends with my pavlik. And thats a different story. Oh, you stole her from her boyfriend . And since then im suffering. They lived happily ever after for how many years . 15 . 130. No, contenders. Many wbut hope. Ms come with high hopes, doesnt work on wrinkles. Clinically proven neutrogena® rapid wrinkle repair with the fastest retinol formula available, it works on fine lines and even deep wrinkles. Youll see younger looking skin in just one week. Stop hoping for results, and start seeing them. Rapid wrinkle repair. And for dark spots rapid tone repair. From neutrogena®. Reporter a beloved prosecutor, mark hasse, had just been shot outside the courthouse in kaufman, texas, during the morning rush. 9024, check. Reporter officer Jason Stastny was one of the first on the scene. When i pulled up, i saw a man. He was laying here in the street. Reporter youre seeing the dramatic images from officer stastnys onboard camera. And there was a woman that was over him. Looked like she was doing cpr. Reporter that woman had witnessed the shooting from her car, saw the shooter flee, then tried to help mark. Now, stastny was taking over, going on instinct and adrenaline. This was one of those scenes when you pull up, its something you can prepare for. Reporter he knew right away it was bad. He looked at me and then he stopped breathing and thats when i started cpr. There you go. There you go, buddy. Keep breathing for me. I got him to take seven breaths. I do remember that. Reporter as his carcam kept rolling, stastnys body mic picked up his pleas for mark to hold on just a little longer. Get you another breath, mark. Come on. Ems is almost here. The ambulance is coming. You know, i tried my best to tell him, you know, youre doing good, youre doing good. Keep breathing. The ambulance is coming. Reporter officer stastny had been at the scene for five agonizing minutes when the ambulance rolled up. Anyone know anything about him . Hes one of the d. A. Prosecutors. Reporter back at the courthouse, Shannon Hebert was getting updates on mark. I dont really know how many minutes passed by when another prosecutor came into the courtroom saying how bad it was. Reporter about an hour earlier, shannon had walked from the parking lot to the courthouse. Thats the same route her friend and colleague, mark hasse, was walking when he was shot. Now, too afraid to go anywhere, she stayed inside, praying for him. We are now just waiting to hear if hes gonna live. Reporter but bad news traveled fast. It didnt take very long for his trial partner to walk into the courtroom shaking her head and crying. And i think at that point we knew he was gone. I can only imagine how horrible a moment like that is. Its horrible. It will it will be in my brain forever. Like, ill never, ever forget that. Theres not a day that goes by that i dont go by here and and think back to that day, exactly what happened, exactly what i saw. Mark hasse was dead at 57, gunned down on his way to work, a block from the courthouse. People in kaufman are shocked by the deadly attack out in the open in the town square. I just never in a million years would have expected one of our prosecutors, much less somebody i knew personally, to be laying on the ground dead. Reporter with one of their own down, lt. Jolie stewart, from the county Sheriffs Department, quickly joined the swarm of Law Enforcement jumping on the case. We didnt have time to grieve about it. We didnt have time to talk about our feelings. It was time to go to work. Reporter lt. Stewart and others canvassed the area but solid information was hard to come by. Witnesses said the shooter hopped into the passenger side of the getaway car as it sped away. So there had to be at least two people involved. They also said the car was silver. Or was it gray or tan . A fourdoor, maybe a ford taurus but with no license plate. The rest of that day, we were just going around looking for, you know, the car. I dont think ive ever noticed how many silver or light colored fourdoor sedans there are. Reporter and, even though the killer had brazenly attacked during the morning rush, witnesses said he covered up. One of the witnesses described him as wearing a hoodie that was black and covered their face. And then, another person who saw him from a distance said, you know, all black, you know, dark clothing. Reporter but there was something more. A witness in a garage right across the street heard the victims last words. Mark said, no, no, im sorry. And that was it. And that was after a little bit of kind of a shoving match. Did that tell you that these two knew each other . That seemed very personal to me. Reporter no weapon was found at the scene and no shell casings either. Did that tell you anything that there were no shell casings . Yes, it told us there was gonna have to be a revolver. Reporter thats because revolvers keep bullet casings inside the gun after firing. I can only imagine how terrified mark must have been in those final moments. Mark was doing what he did every day. He was walking to his office with his little cooler for lunch and his briefcase just going to work. Reporter now, his fellow prosecutors feared he died for that work. And they could be next. No one felt safe. All of us were scared. We didnt know if there was a bunch of people waiting to try to shoot us. Reporter the courthouse was locked down in the morning then closed for the day. Prosecutors and office staff were given extra security. They were walking us to our cars carrying huge rifles and guns. When did it start to sink in for you that this couldve been me . You walk into work with mark. Your office is is right there. I think that was the immediate fear. It could have been any of us. We lost a really, really good man. Reporter District AttorneyMike Mclelland stood tall when he addressed the media about the killing of his good friend. I hope that the people that did this are watching. Because were very confident that were gonna find you. Were gonna pull you out of whatever hole youre in. Were gonna bring you back and let the people of Kaufman County prosecute you to the fullest extent of the law. Reporter mikes stepdaughter, christina, watched his takenoprisoners press conference with immense pride. Thats not an unusual thing for him. He you know, when he really, truly felt deeply about something, then he was going to make a stand for it. He was gonna make a stand with his beliefs and really try to do the right thing. Mike was on a mission. Oh, he was on a mission. Thats for sure. And he was going to find who did this and bring them to justice. But bringing this killer or killers to justice would take a lot more than tough talk. This was just the start of a crime spree that would terrorize the very people who protect us. Now no one was safe. That investigation would also present an overwhelming challenge, thanks to a suspect list including the hundreds of defendants mark had put away. Many of those people. Reporter were starting to parole out. Any one in particular stick out in your head . Apps. If its not an iphone, its not an iphone. Mcdonalds is getting together a mix of fun new flavors this summer. With the new oreo frappe and the new real lemonades from mccafe. vo your love is purely thoughtful, purely natural, purely fancy feast. New delicious entrees, crafted to the last detail. Flaked tuna, whitemeat chicken, never any byproducts or fillers. Purely natural tastes purely fancy feast. Looks like you left these two west coast birds behind foster farms chickens california grown. You guys arent from here. Wrong we love yoga and sunshine and stuff. Well foster farms chicken has no added hormones. Well i wish you didnt have any added negativity ha high five yeah hes not going far. Theyre local. Introducing fresh and natural chicken. California grown with no added hormones. From foster farms. Simply better. I mean we really did love him. It was devastating when he was gone. Reporter monday morning, four days after the murder of mark hasse, fellow prosecutor Shannon Hebert returned to work with a heavy heart. Of course, it was a hard monday at our weekly meeting without mark. Our whole office was devastated. I mean, his door was closed. Reporter security remained tight in and around the courthouse. The people inside took on a bunker mentality. Folks are trying to deal with what happened. Nobodys ever done this before. This is New Territory for everybody. Reporter his colleagues were terrified and many wanted to carry guns for protection. District attorney Mike Mclelland made it easier for everyone to get concealed handgun licenses. We could take the course for free,