Question:  "Cold North Killers: Canadian Serial Murder" is a 2012 Canadian non-fiction book that documents the lives of sixty Canadian serial killers one of whom was a former what?
Sentence (from "Russell Williams (criminal)"): Williams was also a decorated military pilot who had flown Canadian Forces VIP aircraft for dignitaries such as Queen Elizabeth II, Prince Philip, and the Governor General and Prime Minister of Canada.
Relevant evidence: No