The commander of Canada's largest air force base is to plead guilty to the murder of two women and the sexual assault of two others, his lawyer says. Col Russell Williams once acted as pilot for Queen Elizabeth II and was in charge of Base Trenton in Ontario - Canada's busiest air force hub. His lawyer told an Ontario court he would plead guilty to all charges. He is also charged with 82 counts of breaking and entering. Prosecutors said he had stolen women's underwear. One woman was found dead in her house in November 2009. The other went missing in January this year. The murder victims were Marie Comeau, a 38-year-old corporal, who lived in Brighton, Ontario, and Jessica Lloyd, 27, a resident of Belleville, Ontario. The Ottawa Citizen newspaper reported that police had seized 500 items of women's underwear from Col Williams's home in Ottawa. He was able to lead an elaborate double life and was able to keep it successfully concealed," said a senior officer who once promoted Col Williams, retired Lt-Gen Angus Watt.