exactly. i know it. it all does dna matching. no sign of any struggle. >> an underground parking garage. was it a thrill killing? this guy was meticulous. it was terrifying. >> reporter: tetreault stumbled backward with every blow closer and closer to the open garage door. >> reporter: a single mother and her teenage daughter, ambushed in their bedrooms. >> it's like life flashed before my eyes, like oh my god, my family is never going to see me again. -no, no. they work to help you, and they do it all for free. None of Twitchell's films have ever been released. there's anything and everything. >> reporter: after the presentation of the hard evidence, twitchell's friends and co-workers were called to testify. like he kills these guys that get off in court. tide pods child-guard packaging. no, it wasn't a snuff film. and any place. short film. as bill clark and his colleagues closed in on movie maker mark twitchell they seized his office computer, found it in his house. a knife with blood on it. >> reporter: it'd been abandoned and it was secluded. so he finally decided to toss them down one of edmonton's thousands of storm drains. >> reporter: so he checked out. >> and then it's like whoa. there's something for everybody on audible. one of the ways i do that is to get them out of the home. squad cars prowled the streets as the autumn light angled toward the horizon. could be described as a diary. but how? >> i was thinking, great. >> there was a lot of sadness for me, but all i can do is speak for john and the kind of person i was. and it could be your first treatment. 4. was all this just some big stunt, even a publicity stunt? i think he wanted to see how someone died so maybe he could make a better story. an up arrow. told twitchell he was seizing his car. the head of the medical association is firing back at president trump after he suggested that doctors were lying about the number of patients dying from coronavirus. The book will cover the entire case and trial, focusing on the lives of both Twitchell and Altinger, as well as the police investigation that unravelled the bizarre motive. building blocks to a cutting edge entertainment concept consisting of both book and film, but there was more twisted reality. to generate publicity, twitchell said he first needed to create an online urban legend. he's involved up to his neck in this. or a treatment for a dexter episode. and without any explanation, he handed over a printout of this, google map. >> i immediately thought, he's going to rape me. is that a good idea? all of it. the next day, clark and another detective took twitchell out of jail and drove him around edmonton hoping he'd give up some information. i can do it any time. there's something fishy going on. that of the deranged, masked murderer. don't get prevnar 13® if you've had a severe allergic reaction to the vaccine or its ingredients. >> i have never in my life felt fear like that. the detective monitoring the interview sent a patrol car to check it out. >> reporter: the next step, seemed simple enough. had never even been arrested. airborne. >> sure enough, he comes after me and grabs my legs and he starts dragging me back. >> reporter: because once again as the interview proceeds the young film maker is the very picture of cooperation. >> yes. >> i think he thought it would just deteriorate to a point that it would be unidentifiable or no one would ever look, right? Tonight’s Dateline entitled, “Deadly House Of Cards,” is a repeat show that was aired in 2014. seemed like a hoax right from the opening paragraph. >> every nightmare you've ever had, all of a sudden it's right here. into me. and then that final audience trooped back into the courtroom and gave him his last review. vote 'yes' on prop 19. tell them [record scratch] the party's over. >> reporter: when "dateline" continues. >> he told me you do it like dexter. >> we don't usually go to missing persons. >> he told me, "well, you do it like 'dexter'." >> i still like coming to work. me against him. tell me who you are. i did a lot of research online and find out he was legitimate. >> was the disappearance staged somehow? >> you almost wonder whether or not he was doing it as a publicity stunt. robinwithout the commission fees. Mark Andrew Twitchell (* 4. i actually rather enjoyed doing it. >> we're going to the computer guys, come on. i have dark thoughts, and i shared them with a serial killer. >> reporter: this was johnny altinger's tomb. d on-ti. >> reporter: but in "sk confessions" the violence is graphic. >> reporter: visible blood? had to break in, actually. >> they found nothing. his chest is heaving. >> it was a huge part. >> reporter: he was in a battle for his life. it's really cool. smart. sort of a hall of mirrors type story. i better fight for my life. it's an older neighborhood. and if he was rattled, he certainly didn't show it. >> reporter: dark? and was it all part of an elaborate hoax? a makeshift movie studio. more than any other immune support brand. >> reporter: what is it like to be sitting alone in your apartment in front of your computer with that realization in your head? >> that's where he stood. >> so i try to make a run for, it. almost another closing moment for me. so clark paid twitchell's dad and mom a visit. Mark Twitchell killed Johnny Altinger after luring him to his home by pretending to be looking for a date. thank you very much. him she'd meet him there? i love it so much. they had crews go down, search each one. >> mark twitchell is known as a prankster. >> she looked beautiful in her profile. for short. he couldn't get in. i mean, he actually found a way to describe an entire police investigation that incriminated him to get him off scott free. but without a body in a case as bizarre as this one how could any jury be sure important parts of this "sk confessions" weren't just some fantasy from the dark side? fantasy. rene wearing was unsettled too the day she testified but for another reason all together. >> sure. >> this is what i like. mr. cooperative. we got nothing. >> you humiliate your victim, knock him over the head, beat the [ bleep ] out of him, chop him up, carve him up. it was halloween in edmonton, canada. i like the idea of this. >> reporter: police also tracked down toronto actor robert barnsly, who played the starring role in "house of cards." >> reporter: was it finally a break? getting really into a story can totally transform where you are and your mindset. EDMONTON — American TV news magazine Dateline NBC will feature my forthcoming book on the Mark Twitchell case and trial during a two-hour special to air this Friday. true crime podcasts. >> what gilles actually heard was the sound of handcuffs as they neared his wrists and said he felt the attacker was undoing his belt. audible originals. keytruda is not chemotherapy... it's the immunotherapy used to treat more patients with advanced lung cancer than any other. so, what are you waiting for? >> we started with the basics. when "dateline" continues. one more game of backgammon? what in the world just happened? some of the stories that claim to be true aren't. the big thing there though is he. i'd be out with a flashlight looking down. NBC Dateline’s ‘Deadly’ House of Cards EDMONTON — American TV news magazine Dateline NBC will feature my forthcoming book on the Mark Twitchell case and trial during a two-hour special to air this Friday. >> reporter: former crime reporter steve littleviewan has written a book about the twitchell case, "the devil's cinema." in the very backyard garage an independent edmonton film crew was using as a studio. every time i learn something new, it just fuels the curiosity to explore more, to learn more. this is what he used and every single tool in that kit had our victim's dna on it. must have been a reason. i had no doubts about that. i can't get down, if i get down on the ground, i'm -- >> reporter: you're cooked. it was one of the first things i got into television on. >> then i will. now my forte the bad cop is coming out. the game's on. she smiled. you . >> i can't remember the last word of the e-mail but he says if anything happens to me you know where i'm at. if you want to save fifteen percent or more on car insurance, you switch to geico. and twitchell agreed.