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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...

To parole out. >> somebody held the grudge, and got out and wanted him. >> reporter: even though investigators were convinced he was murdered because of his job as a prosecutor they doesn't stop there. >> we have to interview friends and family members and associates. >> reporter: mark was a tea tottler and he did not have a wife or kids. >> there was nothing there, he loved his mother who lived in dallas, he spent time taking care of her and taking her to dinner. >> reporter: all the initial checks in to his professional and personal life was not panning in. frustration was setting in. the ca...

The very people that protect us. now, no one was safe. coming up: that investigation would also present an overwhelming challenge. thanks to a suspect list including the hundreds of defendants that mark had put away. >> i immediately started to think of the organized crime cases and the murder cases many were starting to parole out. >> reporter: anybody in particular stick in your head? when "dateline" continues. telin. or powders, try the cooling, soothing relief or preparation h, because your derriere deserves expert care. preparation h. get comfortable with it.