Colonel Russell Williams (C) talks with Canada's Chief of the Defence Staff General Walt Natynczyk (L) and Defence Minister Peter MacKay in Trenton, Ontario in this January 17, 2010 handout photo. Canadian police said on February 9, 2010 they are looking at reopening cold cases of slain women after having laid murder charges against the commanding officer of the country's largest military air base. Colonel Williams was charged on February 7 with the murder of two women, one of them a soldier at his air force base in Trenton, Ontario. Picture taken January 17, 2010. REUTERS/Canadian Forces Combat Camera/Warrant Officer Carole Morissette/Handout (CANADA - Tags: CRIME LAW MILITARY) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS