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“The Dexter Killer:” Inside the mind of a murderer

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Gilles turned around and came face to face with a man in a hockey mask.

Edmonton Crown Prosecution Office


A look at the evidence in “The Dexter Killer” case; plus, letters from the man police say wanted to be like fictional serial-killer Dexter Morgan.  

An important piece of evidence was the hockey mask the killer wore when he attacked his two victims in October of 2008. Gilles Tetreault managed to escape the assault, but Johnny Altinger was murdered by the masked man.

Gilles Tetreault: The first targeted victim

Gilles Tetreault

CBS News


On October 3, 2008, Canadian man Gilles Tetreault followed directions to a location in Edmonton where he was supposed to meet a woman named “Sheena” he met online.

Deadly directions

A copy of the directions that Gilles Tetreault was sent by

Edmonton Crown Prosecution Office


A copy of the directions that Gilles Tetreault was sent by “Sheena.” His supposed date had refused to give him the actual address of the house where they were to meet, but instead sent him detailed directions to the location, letting him know that “the garage door will be open for you.” 

The garage

Mark Twitchell garage

Edmonton Crown Prosecution Office


After Gilles  Tetreault entered through the partially raised door into the darkened garage, he felt someone grab him from behind. 

The attack

A few seconds upon entering, Gilles felt someone grab him from behind and start prodding him with this stun baton.

Edmonton Crown Prosecution Office


Gilles Tetreault quickly realized this wasn’t a date, as he came face to face with a man in a hockey mask who shocked him with this stun baton.

Fight for life

The plastic gun a masked intruder used to order Gilles Tetreault to the ground

Edmonton Crown Prosecution Office


The masked man took out a gun and ordered Gilles Tetreault to the ground and placed duct tape on his eyes. While Tetreault was on the ground he decided “if I’m going to die, I’d rather go my way than his way.” He got up, ripped the tape from his eyes and grabbed the attacker’s gun. That’s when he discovered it was made of plastic.

The escape

Gilles ran into the alley behind the garage and collapsed at this intersection in front of a couple out for a walk.

Edmonton Crown Prosecution Office


After a violent struggle, Gilles Tetreault managed to escape from the garage, and quickly drove away.

He failed to report the scare to the police out of embarrassment. With each day that passed,  Tetreault convinced himself the attack wasn’t as serious as he first thought.

Johnny Altinger

Johnny Altinger

Edmonton Journal


But only a week later, the masked man would find his next target, Johnny Altinger, who wouldn’t be as lucky as the first victim. 

An unusual email

After vanishing 3 days earlier, friends and family of Johnny Altinger received a strange email

Edmonton Crown Prosecution Office


On October 10, 2008, Edmonton man Johnny Altinger vanished after answering a similar dating ad on the plentyoffish.com website. Concern turned into alarm for Altinger’s friends and family when, three days after he vanished, they received this unusual email from Altinger’s account. They knew this was highly out of character, so they reported him missing to the police.

Movie set turns into a crime scene

The exterior of the garage where Gilles was to meet his date.

Edmonton Crown Prosecution Office


Johnny Altinger’s friends were also able to hand over the directions Johnny had forwarded them before his date. Those directions led police directly to that garage, which turned out to be rented to an aspiring filmmaker named Mark Twitchell. 

Mark Twitchell

Mark Twitchell

Edmonton Journal


Mark Twitchell, 29, had rented the garage space to film his movie “House of Cards.” The short film featured a killer luring men to a garage and murdering them. 

Pools of blood

Forensic tests revealed a large amount of blood had been shed on the garage floor

Edmonton Crown Prosecution Office


An initial search of the garage uncovered what appeared to be blood spatter, which Twitchell told police came from the “House of Cards” execution scene he was filming. When investigators asked an actor from the film how much fake blood spatter there was from his scene, he responded “None.” Luminol tests later revealed excessive amounts of human blood that wasn’t visible to the naked eye. 

Dexter fan

Scene from

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During their investigation, investigators learned that Mark Twitchell was a devoted fan of the Showtime series “Dexter” about an avenging serial killer. Twitchell even posed as Dexter Morgan on Facebook.

The kill room

Mark Twitchell's "kill room"

Edmonton Crown Prosecution Office


Police believed Mark Twitchell’s garage resembled a scene right out of the Showtime series “Dexter.” The garage had plastic sheets covering all the windows, a table with blood spatter, and cleaning supplies laid out.

Altinger’s blood in Twitchell’s car

A photo of Johnny Altinger's blood in mark Twitchell's car trunk

Edmonton Crown Prosecution Office


Johnny Altinger’s blood was found in the trunk of Mark Twitchell’s family car — a discovery which led to the filmmaker’s arrest on Halloween day in 2008.

Twitchell’s weapons

Police believe that Altinger was hit over the head with this pipe before being stabbed to death

Edmonton Crown Prosecution Office


Police believe that Johnny Altinger was hit over the head with this pipe shortly upon entering the darkened garage. He was then stabbed to death.

Murder weapon

Investigators also found a knife in Twitchell's car with blood on both the sheath and knife.

Edmonton Crown Prosecution Office


Investigators found a knife in Mark Twitchell’s car with blood on both the sheath and knife.

Twitchell’s laptop

Police find this laptop in Twitchell's trunk and in the deleted files, a document titled "SK Confessions".

Edmonton Crown Prosecution Office


The search of the car also led police to discover a deleted file on Mark Twitchell’s laptop called “SK Confessions.” Despite Twitchell telling the police that the document was a screenplay, investigators would come to find out it was a detailed account of Twitchell’s crimes. 

Image from “SK Confessions”

Edmonton Crown Prosecution Office


Pictured here is the beginning of “SK Confessions,” which would become a key piece of evidence in the case against Mark Twitchell. The first lines read “This story is based on true events. The names and events were altered slightly to protect the guilty. This is the story of my progression into becoming a serial killer.”

Script or diary?

Mark Twitchell drum evidence

Edmonton Crown Prosecution Office


From the hockey mask to the lead pipe to the “Dexter-prepped'” garage, the police noticed that line by line the details in “SK Confessions” were aligning directly with the evidence they found at the crime scene. One passage spoke of the killer trying to burn remains in a barrel; police found this burned barrel inside Mark Twitchell’s garage.

A look at the evidence

Detectives go to the media in search of Twitchell's first victim, hopign he'll come forward

Edmonton Journal


One piece of the puzzle that had the police stumped was the fact that “SK Confessions” spoke of a victim who got away. Find that person, the police thought, and you’ve proved that “SK Confessions” is real and not the fictional screenplay Mark Twitchell claimed it was. Pictured here is a detective holding up a photo of the hockey mask that authorities believed anyone who had escaped from Twitchell would remember.

Seeing the hockey mask at this police press conference is what prompted Gilles Tetreault to finally come forward.

Letters from “The Dexter Killer”

Steve Lillebuen

CBS News


While preparing to cover the trial for the Edmonton Journal, Canadian investigative journalist and MacEwan University professor Steve Lillebuen began corresponding with Mark Twitchell after receiving a surprise call from the soon-to-be-convicted killer himself. 

Map to the body

Mark Twitchell map to find body

Edmonton Police


In June 2010, as Mark Twitchell prepared to take the stand at his trial and argue that he had “accidentally” killed Johnny Altinger in self-defense, he decided to finally disclose the location of Altinger’s body. Seen here are Twitchell’s handwritten directions on a Google map. The directions led police to a manhole where Twitchell had dumped Johnny’s remains. 

“No root cause”

Mark Twitchell letter

Mark Twitchell letter


During their correspondence, Steve Lillebuen pressed Mark Twitchell to explain himself but he wasn’t able to get a satisfactory answer from Twitchell. 

“It is what it is”

Mark Twitchell letter

Mark Twitchell letter


In the excerpt shown here, Mark Twitchell states, “It is what it is and I am what I am.” 

“The Devil’s Cinema”

"The Devil's Cinema"

McClelland & Stewart


Steve Lillebuen writes about these letters in his book “The Devil’s Cinema: The Untold Story Behind Mark Twitchell’s Kill Room.”



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House Ethics Committee planned to vote Friday on whether to release report on Matt Gaetz

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The House Ethics Committee, which has been conducting an investigation into sexual misconduct and obstruction allegations against Rep. Matt Gaetz of Florida, scheduled a vote for Friday on whether to release its report, according to three sources with knowledge of the committee’s work. 

Hours after President-elect Donald Trump said he planned to nominate Gaetz to be attorney general, Gaetz resigned his congressional seat, effective immediately. 

“I do not intend to take the oath of office for the same office in the 119th Congress, to pursue the position of Attorney General in the Trump Administration,” Gaetz said in his resignation letter obtained by CBS News 

House Speaker Mike Johnson told reporters that there was about an eight-week period during which Florida Gov. Ron DeSantis could fill his seat by setting the date for a special election.

Now that Gaetz has resigned, it is unclear whether the panel will vote on releasing the report, since Gaetz is no longer in Congress.

There is precedent in Congress on the Senate side for an ethics committee report to become public after a member resigns from Congress, however. In 2011, this happened when Sen. John Ensign of Nevada resigned amid allegations that he tried to hide an extramarital affair.

But it’s not clear that that would apply to the House, leaving open the possibility that the report on Gaetz would not be released. 

In June, the House Ethics Committee released a statement saying it was investigating a range of allegations against Gaetz, including sexual misconduct, illicit drug use, and bribery.  

Multiple sources at the time told CBS News that four women had informed the House Ethics Committee that they had been paid to go to parties that included sex and drugs, and that Gaetz had also attended. The committee has Gaetz’s Venmo transactions that allegedly show payments for the women. 

Gaetz has repeatedly denied wrongdoing and has called the committee’s investigation a “frivolous” smear campaign.

Some of the allegations of sexual misconduct under review by the committee were also the subject of a previous Department of Justice probe into Gaetz.  Federal investigators sought to determine if Gaetz violated sex trafficking and obstruction of justice laws, but no charges were filed.  

The House Ethics Committee resumed its investigation into Gaetz in 2023, following the Justice Department’s decision not to pursue charges against him.  

Gaetz has long blamed then-House Speaker Kevin McCarthy, also a Republican, for the probe. And Gaetz later led the movement to sack McCarthy as speaker. 



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Democratic Congressman on the party’s messaging, focus

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Democratic Congressman on the party’s messaging, focus – CBS News


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Democratic leaders are divided over what to blame for their 2024 election losses. Democratic Rep. Seth Moulton of Massachusetts joins “The Daily Report” to discuss the party’s messaging and focus.

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11/13: The Daily Report – CBS News

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11/13: The Daily Report – CBS News


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Lindsey Reiser reports on the reaction to President-Elect Trump’s latest leadership picks for his upcoming administration, what new data tells us about the state of the U.S. economy, and the potential impact of Trump’s proposed energy policies.

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