Criminals who knew other criminals

William Atchison and David Ali Sonboly: Talked to each other on the gaming platform Steam, also played GTA 5 and Counter Strike together

Brenton Tarrant and Anders Behring Breivik: Tarrant claimed in his manifesto that he had contact with Breivik before he committed the 2011 Norway Attacks

William Atchison and Carter Boyles (Failed school shooter): Carter Boyles was a 15 year old boy who planned a shooting rampage at Jefferson High School in Cedar Rapids Iowa in 2016, but didn't go through with his plan, and shot himself. Atchison and Boyles knew each other through YouTube and Steam (fun fact: I had contact with both of them, RIP Carter I wish I could have talked to you more man)

Dillon Cossey (failed school shooter) and Pekka-Eric Auvinen: Dillion Cossey was a 14 year old boy who plotted a Columbine style attack on Plymouth Whitemarsh High School in Pennsylvania but was arrested and sentenced to juvenile detention. He was in contact with Pekka-Eric Auvinen the Jokela High School shooter who killed 8 people and himself through Myspace and YouTube where they talked about the Columbine Massacre.

I really think that William even don't planned mass murder. He want died as a failed shooter like Carter. I don't believe that he can't found another people in school. And his last Youtube-account where he uploads videos 1 day before shooting was Bob 2.0. He clearly mean Carter.

Alek Minassian claimed to have met Elliot Rodger and Chris Harper-Mercer online. It's most likely bullshit though.

Ted Kazcynski knew Timothy McVeigh and Ramzi Yousef, the 1993 World Trade Center bomber. All three were in the same maximum security prison and talked to each other during their one hour of recreational time they had each day. They talked about religion, politics, and even shared books.

These are serial killers of course but Edmund Kemper and Herbert Mullin famously knew each other as they had cells near each other. Kemper apparently disliked Mullin very much.

EricsToastInTheCaf wrote:

These are serial killers of course

thats cool that's why its called criminals who knew other criminals its not like it said shooters who knew other shooters, its just being in general

Trey Eric Sesler was friends with James Seevakumaran, who almost committed a mass shooting at his college but killed himself instead. They talked about mass shootings together for quite a while. Trey sent him a letter from prison, but it arrived the day after his suicide.

I heard from someone on Reddit who knows Ryan Hribal, the brother of Alex Hribal (Franklin Regional High School stabber), that he is close friends with Maxwell Morton in prison. Maxwell shot and killed his friend and posted it on Snapchat.

Not sure if this count since he was in a prison already, but João Pereira Lima knew a bunch of other criminals during the time he was imprisoned in Iilha Anchieta until the riot in 1952 that killed more than 110 prisoners and guards. He personally killed 20 members of his gang while escaping in a boat in an attempt to shrink it in June 20, 1952 (he was captured in July 1952)

Source: Amok wiki and UBATUBENSE...Eventos e História da Ubatuba Antiga

Mitchell Johnson,one of the Jonesboro school shooters,became friends with Justin Trammell, a fellow murder who killed his dad with a crossbow when he was 15 while in prison.They later became roommates after there release and were arrested at a traffic stop on January 1st,2007 when it was found that Johnson had marijuana and a 9mm handgun on his person.

Apparently Patrick Kearney knew Lee Harvey Oswald.

Alek Minassian allegedly interacted with Elliot Rodger online

CountAnton wrote:

Alek Minassian allegedly interacted with Elliot Rodger online

Alek lied about that for attention.

I once heard a story from someone about Gerard Schaefer and Ted Bundy. Schaefer knew more about Bundy than he ever said.

On March 29th 2005 nephew of convicted killer Katherine Mary Knight James Patrick Roughan and his friend Christopher Clark Jones stabbed and bashed 17-year-old homeless teenager Morgan Jay Shepherd over 130 times before decapitating him with an axe in Dayboro, Queensland, Australia, after a lengthy drinking session; Shepherd's head was used as a puppet and bowling ball, according to witnesses, 

Three youths who cannot be named because of their age were sentenced to two years detention for helping dispose of the body

Christopher Clark Jones was released on parole in January, 2020, and was deported to the U.K 



I.D.K what happened to James Patrick Roughan if any one knowns can they please respond?

The Eslov and Kristianstad school attackers talked to each other over the internet

Ian Brady was friends with Graham Young in prison and both had a shared interest in Nazi Germany, and played chess together. Apparently Ian would always beat him at chess? I think I read somewhere Brady was also imprisoned and played chess with Peter Sutcliffe?

Myra Hindley and Rosemary West were close friends in prison and bonded with each other over their crimes, and eventually became lovers for a short time

Philip Smith (spree killer) and his family were former neighbors of Fred and Rosemary West

Techv4921 wrote:

I once heard a story from someone about Gerard Schaefer and Ted Bundy. Schaefer knew more about Bundy than he ever said.

Gerard had supposedly boasted to Ted in prison that he killed more than him and told him "I'm the best Ted" or something like that and Ted believed him? Ofc theres the possibility Schaefer was just bullshitting all this for the interview

Henrique Lirad Trad met the 14 years old School shooter in Bahia 2022

Larry Murphy, convicted rapist and possible serial killer, was friends with Rory O'Connor who raped two women at knife point and later killed his fiancée. They first met at Arbour Hill Prison and later hanged around with each other in Amsterdam after getting released.
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While not knew of him in the traditional sense, Norio Nagayama witnessed Misao Katagiri's shootout with police in Shibuya, Toyko, Japan in 1965

Kosta Kecmanovic bragged about knowing Timur Bekmansurov. Chances are that Kosta wasn't trolling and he was actually being fr.

Morné Harmse knew Cecilia Steyn, the leader of the Electus per Deus cult, who murdered 11 people between 2012 and 2016.

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Jeff Weise and Adam Fulton (livecorpse) were both apart of the same Newgrounds artist collective (clockcrew)

Jeff Weise likely posted on a forum about Columbine, of which Sebastian Bosse frequented as well. Cannot be 100% confirmed due to not enough archiving on the forum.

Kimveer Gill, Jeff Weise, and Sebastian Bosse were likely all in the same MSN Columbine groups at one point. Likely not all at the same time though. Although this is just pure speculation, it is known all three of them were active on MSN Columbine discussion groups. Just a slight possible connection.