Mark Andrew Twitchell was born in Edmonton, Alberta, on July 4, 1979. That's because police were still looking for Johnny Altinger's red Mazda. Mark said, Its what it is and Im what I am. The Dexter Killer is still serving his sentence in Saskatchewan Federal Penitentiary and still enjoys watching Dexter. That's when he grabbed my legs and started pulling me back to the garage. Det. Bill Clark: Well, John's friends were concerned. Bill Clark: It's almost like, at times, Mark Twitchell lives in a fantasy world. Mark, on the other, hand used media for his appeal. And her suspicions kept growing with another email he sent. Something inside my head just gave me red flags and said, "He did it.". But there was one clue that would give police their first big break in the case. Dexter Killer: Everything about Mark Twitchell, the Killer who wore a Hockey This story is based on true events. Eventually, Twitchell revealed his true identity. Bill Clark: When you you read all the experts' books about these type of individuals is they tend to like the media attention. Which is a it's actually a full-blown feature that's actually gonna have a decent budget in the neighborhood of about three-and-a-half million . Det. We don't even know if we have a crime. This is who he is. The Dexter killer, whose real name is Mark Andrew Twitchell is a Canadian filmmaker who is convicted of the first-degree murder of John But I said I couldn't do it. This story is based on true events, Mark Twitchell wrote. Then a year-and-a-half after Johnny Altinger disappeared, Twitchell, while awaiting trial, broke his silence and gave the police a map. Seven days after Tetreault was attacked, police say Twitchell wasn't going to make the same mistake twice. The film still hasnt been released to date. Soon after the divorce, Mark Twitchell returned to Edmonton to spearhead a low-budget $60,000 He was to be in Provincial Court yesterday to enter a plea, but the case was put over to Nov. 26 so lawyers for both parties can sift through the evidence. Twitchell, then 29 years old, a married man with a young daughter, had used the garage as a set for a recent movie project. On October 3, 2008, Gilles Tetreault drove to a garage in Edmonton, believing that he was about to meet a woman named Sheena whom hed met on a dating site called PlentyOfFish. So anything you guys have in this, or if you've ever even heard of it, post away, because I have no idea what this is. It's a rare look inside the mind of a killer. A star only in his own warped mind | Edmonton Journal If you want to delve into more details, watch the CBS 48 Hours Season 34 Episode 38: The Dexter Killer here. Police began digging deeper into his background. Something goin' on here.". Police discovered Twitchell spent countless hours making elaborate Halloween costumes. Desperate for some answers, Johnny's friends broke into his apartment. Lillebuen said: "He had a kill room set up with plastic sheeting. Interestingly, the document police had found in Twitchell's laptop titled "SK Confessions" also referenced a crumbling marriage and secrets. In early 2011, Mark Twitchell faced charges of the first-degree murder for killing John Brian Altinger. In March of 2011, Mark Twitchell went on trial for the murder of Johnny Altinger. Twitchell denied knowing anything about a missing man or a red Mazda and he had no problem with the police wanting to search the garage. He sort of describes it in seductive language.