Scripting a Murder

Mark Twitchell was an aspiring filmmaker who wrote screenplays about murder and compared himself to TV's fictional serial killer, Dexter Morgan. In 2008, police were investigating the disappearance of 38-year-old John Altinger and discovered Twitchell's garage where he had just filmed his latest project about a serial killer. “48 Hours" Correspondent Troy Roberts reports. This classic "48 Hours" episode last aired on 7/10/2012. Watch all-new episodes of “48 Hours” on Saturdays, and stream on demand on Paramount+.