Since I live in Canada, i am more interested in the number of serial killers there have been. Interesting that it appears there are no black serial killers on a list of notable serial killers.
Paul Bernardo: also known as "the Scarborough Rapist"; a Toronto man who killed three teenage girls (including his wife's sister) with the aid of his wife Karla Homolka
Wayne Boden: also known as "the Vampire Rapist" killed 4 women between 1968 and 1971; died in prison 2006
John Martin Crawford: convicted in 1996 for the murders of three women
Léopold Dion: also known as "Monster of Pont-Rouge"; raped and killed four young boys in 1960; murdered in 1972 by a fellow prison inmate
William Patrick Fyfe: convicted of killing five women in Montreal; suspect in several other murders
Gilbert Paul Jordan: also known as the "Boozing Barber", killed between 8 and 10 women by alcohol poisoning in Vancouver; died in 2006
Cody Legebokoff: one of Canada's youngest serial killers, convicted of murdering three women and a teenage girl around Prince George, British Columbia between 2009 and 2010
Allan Legere: also known as "Monster of the Miramichi"; killer of five individuals
Michael Wayne McGray: killed 7 people, including a woman and child and a cellmate, claims to have killed 11 others
Clifford Olson: murdered 11 children in British Columbia; died in prison 2011
Robert Pickton: Port Coquitlam, British Columbia man charged with the first degree murders of 26 women; allegedly confessed to 49 murders; convicted December 9, 2007 of six charges; reduced to second degree murder
Elizabeth Wettlaufer: murdered eight senior citizens in Ontario with fatal injections of insulin, and gave non-fatal injections to six others, between 2007 and 2016
Peter Woodcock: murdered three children in 1956 and 1957 in Toronto and a fellow psychiatric institute patient in 1991; died while incarcerated in 2010