TUESDAY, JULY 10 (10:00 PM, ET/PT)

Caption: Mark Twitchell

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Mark Twitchell was pursuing his dreams of being a filmmaker when he produced “House of Cards,” a project about a serial killer who creates a fake online profile as a woman to lure in men and kill them.  But was he also a killer? As 48 HOURS MYSTERY correspondent Troy Roberts reports in this updated broadcast, few would have expected the married father and “Dexter” fanatic would become part of a real-life murder mystery. The horror started when Gilles Tetreault arranged to meet a woman he met online – instead, he found himself face-to-face with a madman who set a trap to kill him. He survived, but Johnny Altinger answered a similar online dating ad and never returned from a rendezvous.  Roberts speaks to Altinger’s brother, Gary, as well as Tetreault, who describes the terror he experienced that fateful night.

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