Mark Twitchell, dubbed the “Dexter Killer,” was convicted of murdering Johnny Altinger in 2008 in Edmonton, Canada. Twitchell, an aspiring filmmaker, was heavily influenced by the TV show Dexter and transformed his rented garage into a “kill room” similar to the ones depicted in the show. He lured victims through fake online dating profiles, succeeding in killing Altinger after a failed attempt to murder another man, Gilles Tetreault. Twitchell was convicted of first-degree murder in 2011 and sentenced to life in prison. His case continues to garner attention through books, documentaries, and media