rickerson -- he thought mr.rson owed him back pay. >> matt took the van to texas, where he abandoned it and then crossed into mexico. it wasn't long before he ran into trouble in that country, killing a man outside of a bar, and then serving nine years in a mexican jail. when he was finally extradited to the u.s. to stand trial on rickerson's murder, the court reportedly installed snipers outside just in case he made a run for it. matt also wore electrodes under his suit in court so guards could shock him if he became unruly. his former girlfriend likely sealed his fate, testifying that he confessed to her he had broken rickerson's neck. she said he told her it was an accident. perhaps just as cunning and dangerous was david sweat. at 35, he is supposed to spend the rest of his life behind bars here for killing sheriff's deputy kevin tarsia. after sweat and two other men had robbed a fireworks and gun store, the deputy confronted them. his sister spoke by phone with anderson cooper. >> i never put it out of my m