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hundreds of investigators from multiple agencies had swooped in. >> this was all hands on deck? >> this became the number one case in the bureau at that time. >> fbi special agent michael and his partner, lori gibbs, who has since retired. we're coordinating teams from that task force. each team looking into different aspects of the case. >> we have to look at everything. >> so you decided to just divvy it up, everyone focus on their individual tasks. >> right. and some of these teams had 25 to 30 people on them. and there was a team that looked at all of the victims and what they may have had in common. they believe the killing of the da was linked with the shooting of prosecutor mark hasse he back in january. but it was all one big collective hunch. until a tip came through that would confirm the connection. >> the crime stoppers web based tip line. we get a tip that claims credit for the marchesi murders. >> it came in eastern sunday night. it began, do we have your full attention now?

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will be stepped up security here at the county courthouse today. the district attorney's office will be close to the public. this entire community is on high alert. >> that morning, when chad and came to her office, she had an armed escort. >> there is no leader at your office anymore? >> no one. no one. >> when you come into work, how do you go forward? >> we had to move forward. we couldn't let them win. we couldn't. and we had to fight for the honor of mike and mark. >> everyone in the office was on edge. >> my husband, he stayed up all night with a gun in his hands. >> i know that i started carrying a gun. sleep with a gun under my pillow. >> even shannon, who wouldn't carry a gun before, now slapped with protection nearby. >> we had a big old shark and sitting on our dresser. waiting to go. just in case. >> the killers threat to unleash more violence in kaufman county. kept the task force working around the clock. a special teams scoured this surveillance video get collected near the mclelland

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Dateline

the da kept his own guns near the front door, but never got the chance to use them. >> is it like all bets are off when they're going after family members? >> even though you don't condone, it you almost understand for someone to go after prosecutor for what they do for a living. but to go after the family, is not a line we thought we'd see crossed. >> coming up! just who could pick off law enforcement like this? >> it was just a straight-up whodunnit. >> we're hoping against hope there is going to be a magic clue in that crime scene, or that house, that will answer this riddle for us. >> when dateline continues! c is down with rybelsus®. i'm down with rybelsus®. my a1c is down with rybelsus®.

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nothing like that. >> mark cassie and mike mclelland knew eric williams as a colleague in kaufman small legal community. as boss of the da's office, mike rarely tried cases. but because williams was an elected public official, he made an exception. and teamed up with mark to prosecute the case. christina says that her stepdad believed williams had violated the public trust. >> i think it did offend mike on a basic level. these people elected you, you're supposed to do good things from the community. not steal things from it. >> a jury found him guilty of theft. he got probation, but lost his job and license to practice law. and now, a year later, both men who prosecuted him were dead. and williams was under suspicion. >> did you -- any kind of grudge? >> no. absolutely not. >> the media that went, and just days after the mclelland murders, he was interviewed by nbc affiliate kprc.

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mark hasse had just been shot outside of the courthouse in kaufman, texas during the morning rush. officer jason was one of the first on the scene. >> when i pulled up, i saw a man. he was laying here in the street. >> you're seeing the dramatic images from officer's taxes on board camera. >> one of the women over him look like he was doing cpr. >> that woman had seen that shooting from the car, saw them fully, and try to help mark. now fast new is taking over. going on instinct and adrenaline. >> in most cases, when you pull up. it's nothing you can prepare for. >> he knew right away that it was that. he'll >> you looked at me and then he stopped breathing. and that's when i started doing cpr. >> they go that i keep reading for me. >> i had him take seven breaths, i do remember that.

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they balanced each other very nicely. >> cynthia also wanted her daughter to find love. and was not shy about playing matchmaker with a guy she thought was a good fit. >> she looked at him and said do you believe in arranged marriages? which i had to later apologize for because that is a weird thing to say. >> it's embarrassing! >> it's very weird! >> at the end of march, easter weekend, they were looking forward to a big hammer dinner. cynthia was making it for friends. the perfect time to relax, and not dwell on the tragedy of mark's murder. at least for a little while. >> was there any fear that we need to be on high alert? >> at that point i do not think so. >> christina spoke to her mom and stepdad on that friday night. >> mom is making easter baskets, and mark was griping about would she was doing. -- and she was making a huge mess.

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detail that investigators needed to follow up. and using the crime stopper system, the tipster remained an ominous. if this is going to be the game-changer, investigators within a lot more information. or a little bit more luck. >> you're still hoping for the big break, and maybe a lucky traffic stop. or someone who knows about this murder's gonna pick up the phone and call him, that would be the magic phone call. >> there was something that might lead them to the killer. the way mark had been murdered. the killer had been lying in wait. mark was shot at point blank range. execution style. all of this lead investigators to think that this could be an organized crime hit. >> rumors are sweeping the town! top of mexican drug cartels, and prison games. >> we're open to every avenue. >> nbc's channel five in dallas covered the case from the beginning. and reporter, ken, was there for it all.

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law enforcement at point blank range! coming up! as the investigation grows more urgent, sudden concerns about da mark and his wife cynthia. >> i tried mom, he didn't answer. i tried mike, didn't answer. >> i said okay i'll go on over there. >> and then concern becomes alarm. >> at that point, something is really wrong with him! >> when dateline continues. ness, because knowing that your chronic kidney disease in type 2 diabetes could progress to dialysis is important. b is for belief that there may be more you can do. just remember that k is for kidneys and kerendia. for adults living with ckd in type 2 diabetes, kerendia is proven to reduce the risk of kidney failure, which can lead to dialysis. kerendia is a once-daily tablet that treats ckd differently than type 2 diabetes medications

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to dateline ♪ ♪ ♪ >> marshall afternoon in kaufman county, where hundreds of people did attended our memorial service for mark kathy. >> he was constantly asking for more of my wife's cookies. she makes cookies for the office about once a month, and he would run out in about 12 minutes. >> mark's longtime friend, marcus busch, also memorialized him. >> this world is a better place because of mark. and so are we. the world lost a good man. someone who was resolute, always near the difference between right and wrong, and would fight for that. >> now, special prosecutors toby and bill, along with a multi agency task force were fighting for mark. searching for his killer, but not coming up with easy answers. because he was so close to his friend, an employee, da mark had to bow out of the investigation. he and his coworkers were doing

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arrest warrant. nothing there either. so the task force widened the scope for the investigation beyond kaufman. >> we don't have a lot of violent crimes in kaufman. especially murders. so we naturally thought it was somebody from dallas. >> dallas, the big city less than 30 miles. but seemingly, a lifestyle away. remember, back in the 19 80s. mark and fellow prosecutor, marcus busch, had wrapped up some tough custom mayors. >> i thought it was the murder cases that we had prosecuted. they were having -- >> someone had discouraged, got out of prison, and just wanted him. it was just a personal vendetta against mark. >> even though investigators were convinced he was murdered because of his job as a prosecutor, they did not stop there. >> you stop to interview friends, families, associates. >> mark was -- a, he was not married, and no children. those extensive checks into his background came up empty. >> they're just was not anything there. he loved his mother who lived in dallas. he spent a lot of time taking care of her, taking her to dinner. >> all of the checks into mark

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