He was a square-jawed Canadian Air Force officer with a brilliant future, a man entrusted with flying prime ministers and Queen Elizabeth II. On Monday, he was exposed as a serial killer with a shocking fetish for girls’ panties that he documented in a trove of twisted photos of himself.

At a hearing that reduced victims’ relatives to tears, the lurid photos were shown one by one in court as Col. Russell Williams, 47, pleaded guilty to murdering two women, sexually assaulting two others and committing dozens of break-ins in which he stole underwear from the bedrooms of girls as young as 11.

He faces an automatic sentence of life in prison with no possibility for parole for at least 25 years.

Williams was expressionless and dressed in a somber dark suit. He kept his head down during the 40 minutes it took to read all the charges.

Until his double life came to light with his arrest earlier this year, Williams was the commander of Canada’s largest Air Force base and served as a pilot for some of the country’s top leaders and for the queen during a 2005 visit.

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