Prolific Dallas killer faces execution today 'A twisted side to him'04/22/2003 By JASON TRAHAN / The Dallas Morning News One of Dallas' most prolific killers – whom authorities said derived a sadistic thrill from the more than dozen slayings attributed to him – is scheduled to die by injection Tuesday. Juan Rodriguez Chavez was a high school dropout on parole for a 1986 murder conviction when he went on a killing spree across western Dallas in 1995. The rampage peaked July 2 of that year with the shooting deaths of five people. "It struck me at the time as some...