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Reach him, and he was very proud of that point. i always thought that was very strange. >> and according to leigh ann burke, his marriage was not a partnership of equals. >> mark was definitely dominant. she didn't go anywhere without calling to let him know that she was going or even to ask if it was all right. he refused to let her work. he was the breadwinner. >> two years after joining tlc manufacturing, barton becomes president and leigh ann notices barton's erratic behavior is driving away business. >> then he would do things like change formulas without telling anybody or without tellin...

Himself and his first wife debra, whom he had met and married while attending the university of south carolina. >> mark always prided himself on the fact that nobody knew what he was. no family ever visited them other than her parents. i didn't even know his parents were alive. i just assumed that his parents had died. >> an only child, barton grew up sumter, south carolina, where he attended high school. a loner who excelled in academics, he was one of the few sumter high school students to reach the national merit scholar semifinals, but mark barton kept his past shrouded in mystery, preferr...

Disorder. in hindsight, barton's personality fit clinical patterns of a man on the edge. >> the person that i started to work with and the person that he ended up were two different people. he was not the same person at all. >> secretary leigh ann burke saw mark barton's behavior change over time. she started working with him in 1984 in texarkana, texas, where he was employed as a chemist for tlc manufacturing, a company that made cleaners and solvents. >> he was always kidding around and laughing and making jokes in the beginning. like i said, he was like a 6-year-old in the body of a 35-year...

Championship, and at least 13 people were injured, two critically. more news later but now back to the nbc documentary. due to mature and graphic subject matter, viewer discretion is advised. at the center of any criminal investigation is a "dark heart and the iron hand of justice." july 29th, 1999, every police department in the state gunman walks into two buildings and opens fire. when it was all over, mark barton had killed nine of his co-workers and had critically wounded 13 others. investigators were about to discover that the deadly rampage began two days earlier at his home. that'...

Who has managed to evade the killer once, is still hiding in a dark utility closet, terrorized, wondering if she will be mark barton's next victim. >> i heard running and then i heard one shot fire out, and then an incredible, overwhelming stench of gunpowder, which told me that barton had just passed by. >> eyewitness descriptions of the suspect, a man wearing a red shirt and khaki pants, are broadcast on television and radio. from their office tower facing piedmont road, bookkeeper laurie woodard and her co-workers watch as bedlam unfolds in front of them. >> people are glued to the windows,...