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did you start to think that there was a list? >> no, sure. i don't think there was any doubt in my mind this was a serial killer we were dealing with. >> someone had declared war on law enforcement and their families. >> i have kids. my husband, i can't keep putting them at risk. >> my wife had two guns out. i said unless you know it's me coming through the door, be ready to use them. >> is there some sort of antigovernment militia group? i had no idea what we were dealing with. >> before leading investigators back home. was he living a double life? >> i think he was. >> you're makin...

>> 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...

District attorney mike, made it easier for everyone to get concealed handgun licenses. >> we can take -- for free. and we could have our license if we needed it. >> did you get a gun? >> no. >> did you think about? it >> yeah. >> it's the kind of thing people do when they're scared and panicked. the justice system under attack. the murder brought an all-star army of law enforcement to the case. the sheriff's training center was turned into a command post. it was soon buzzing with local police, texas rangers, and federal agents from the atf and the fbi. >> it was interesting about this case. be...

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 ...

County, where county district attorney mike mcclelland and his wife cynthia have been found shot to death. >> the news touched off a firestorm of public concern. tips started flooding into the reopened kaufman county sheriff's command post. some tips still cited the aryan brotherhood of texas. special prosecutor bill wirskye -- >> with the added media attention after the mcclellands were murdered, we got hundreds of tips a day. >> it was like drinking out of a fire hose during this whole thing. >> lt. jolie stewart of the sheriff's department was right in the middle of it. hundreds of investig...