A man who has evaluated some of Canada's most notorious criminals puts the person who brutally murdered a man in Montreal in the same category.

Forensic psychiatrist Dr. John Bradford has assessed Russell Williams, Paul Bernardo and Robert Picton and said whoever mailed body parts to Ottawa seems similar.

"Dismemberment is not rare, it's a way to hide a crime but he's done the opposite and is seeking publicity . . . and to take the unusual step of taping a murder and posting it?" he said of the murder allegedly being on the Internet.

"People like this tend to do it again."

The subject of an international manhunt, Luka Rocco Magnotta has been accused by police of murder and linked online to animal cruelty.

Bradford said whoever the murderer, they're organized – signs he said are telling of a psychopathic mind.

"It all points to sexually motivated homicide," he said. "It raises the risk of it happening again."

Bradford said he has no explanation why the killer would have targeted a political party, except that it seems attention-seeking.

He said killers like this don't strike again on a pattern, it could be weeks or even months.

With a report from CTV Ottawa's Joanne Schnurr