A British tabloid says it warned Scotland Yard months ago that a man posting videos of himself killing kittens was dangerous.
Luka Magnotta, a 29-year-old Toronto native, is wanted for second-degree murder and indignity to a human body after he allegedly murdered, cannibalized and dismembered a Chinese student in Montreal.
A video of the grisly crime, which has been circulating online, is at the centre of a police investigation.
But this isn't the fist time the alleged killer, who is believed to have fled the country, possibly to France, has garnered international attention over violent Internet videos.
He is suspected to have appeared in online videos killing kittens. In one video, a man drowns the creature. In another, he feeds one to a python.
The U.K. Sun, which had reported on the kitten snuff films, claims it warned Scotland Yard months ago that this man was dangerous.
"We showed cops sick film of a live kitten fed to a snake and an e-mail warning: 'Once you kill and taste blood it's impossible to stop,'" wrote reporters Tom Wells and Alex West in the British tabloid.
The pair claim they tracked Magnotta down in a London flat and spoke to him.
"It wasn't just his appearance that was weird - his behaviour was very odd as well. In a strange, high-pitched voice, he spent 20 minutes denying that he was involved in killing the kitten," West wrote.
"But behind the denials it seemed he was getting some sort of bizarre pleasure out of the attention. I suspected that pleasure was sexual."
Two days later, the paper received an e-mail from someone using the name of a recent murder victim.
The writer claimed to have met two of the paper's reporters, describing them as "sexy."
"It's fun watching people work so hard gathering all the evidence, then not being able to name me or catch me," the note read.
"So, I have to disappear for a while, until people quit bothering me. But next time you hear from me it will be in a movie I am producing that will have some humans in it, not just pussies."
West informed the Limehouse Police Station in East London, who passed it on to the Islington Police in North London.
"After an initial response from the officer in the case I then heard nothing more about it. If the police had stopped investigating Magnotta, then I was not told," West said.
The Sun listed six infamous murderers who started by slaying animals: The Boston Strangler Albert DeSalvo, hitchhiker killer Edmund Kemper, Jeffrey Dahmer, the Son of Sam David Berkowitz, Ted Bundy and the Crossbow Cannibal Stephen Griffiths.
Internet vigilantes have been hunting Magnotta since the kitten videos first surfaced.
Members of the message board 4Chan, the birthplace of the cyber-activist group Anonymous, reportedly raised $5,000 reward money for anyone who could identify the kitten killer, but to no avail.
Meanwhile, in Maple Ridge, B.C., some two dozen cats have turned up killed and mutilated this week.