Da Mark News Today : Breaking News, Live Updates & Top Stories | Vimarsana

>> everyone in the office was on edge. >> my husband, i mean, he stayed up all night with a gun in his hand. >> 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 slept with protection nearby. >> we had a big ol' shotgun sitting on our dresser ready to go just in case. >> the killer's threat to unleash more violence in kaufman county kept the task force working around the clock. a special team scoured the surveillance video collected near the mcclelland crime scene, hoping for a new lead. >> so many people now have surv...

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. >> mexican drug cartels were suspected immediately because of the fact that has he had been ...

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 what th...

>> 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. >> as he is camera kept going, his body mike picked up the audio for him to just keep getting going a little longer. >> ems is almost here, the ambulanc...

Scary. it's not just me anymore, i have no kids! my husband, my family, and, i mean, i cannot keep putting them at risk. mike, cynthia, we were all in danger. >> as deputies began around the rob watch on her house, something kept nagging her about the murders. >> there's no way that she open that door to anyone, it's someone we know, or someone like a police officer. it's so concerning. even a police officer. >> so that someone can be posing as a police officer? >> right! >> and everyone was wondering how the killers got into mclelland's front door. mike like his entire staff was still vigilan...