20/20 S2011E12 - Dexter Fans Turned Killers?

Is a television show and its main character giving some viewers the idea to act on dark thoughts? ABC News Correspondent Jay Schadler reports on two murders which may have been inspired by the hit TV crime show "Dexter." Schadler travels to Rising Sun, Indiana to interview Andrew Conley, who was convicted of killing his younger brother, Conner, and to Edmonton, Alberta in Canada, where Mark Twitchell is currently on trial for the murder of John Altinger. Twitchell, a filmmaker who made a short film about a fictional murder in a garage, is alleged to have returned to the garage to commit murder for real. It's alleged that his movie script may have been a template for an actual homicide.