What began as an obsessive dating habit became a medium for murder for the crazed Grindr killer, Stephen Port. Between 2014 and 2015, the 41-year-old London chef drugged, raped and murdered four gay men after meeting them online and luring them to his house of horrors.

Now, REELZ’s new docuseries takes a look back at the psychopath’s troubled life, dating app obsession and sick murder spree. Including interviews with the killer’s former friend, World’s Most Evil Killers: The Grindr Killer reveals all the red flags Port displayed before taking his love interests’ lives.

“He wasn’t a man, for example, to go out to the pub or to the bar at night. This was a man who lived in his own fantasy created with the help of his internet connection,” explains author and journalist Geoffrey Wansell in the show teaser.

Port created several profiled across many different sites and faked his identity in order to entice innocent young men.

“He claimed to have been in the military, he claimed to have graduated from Oxford University, other times he claimed he was a special needs teacher. And that’s the thing about social media, it enables us to present a whole range of different identities to people,” says criminologist Dr. Elizabeth Yardley.

“And I think what he was essentially doing here was trying on different identities because the self that you create on social media… you can be whatever you want to be,” she adds.

Port drugged and raped and slaughtered every one of his four victims before dumping their bodies near his east London apartment. He was convicted after being found guilty of killing a 23-year-old fashion student, a 22-year-old immigrant from Slovakia, a 21-year-old chef and a 25-year-old forklift driver — all who he met online.

“Steve’s rate of going in and meeting new guys was prolific, so it was not unusual that there would be a new guy every day. Even on the first time he met them he would then announce to me via text message normally that ‘I’ve got a new boyfriend, come around and meet my new boyfriend,’” recalls Port’s ex-pal, Ryan Edwards.

Stephen Port is currently serving a life sentence

World’s Most Evil Killers: The Grindr Killer airs Friday, December 28 at 8 ET/PT on REELZ.

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