THESE are the tell-tale signs that exposed the Queen's pilot as a cross-dressing double murderer in a chilling police interview.

A new documentary reexamines the extraordinary case of British-born pilot Colonel Russell Williams, the highly decorated commander of Canada's largest airbase.

9 Colonel Russell Williams was a decorated pilot who had flown the Queen and was commander of Canada's biggest airbase Credit: Reuters

But when he wasn't flying VIPs around the world, Williams cultivated a bizarre double life, breaking into women's homes and stealing and wearing their underwear.

Within months his fetish - that led to him breaking into a total of 82 homes - had escalated into rape and murder.

The pilot was finally brought to justice in a police interview that features in Voice of a Killer – The Colonel, hosted by Scottish criminologist David Wilson, Emeritus Professor of Criminology at Birmingham City University.

Williams, 55, can be seen scratching his neck and visibly squirming as his interviewer learns about the two murders he committed with his two-and-a-half-year crime spree.

9 Williams had a fetish for women's underwear, admitting to 82 break-ins where he tried on and posed in stolen lingerie Credit: Reuters

9 Williams' deep discomfort can be seen as he squirms in a police interview, where he confesses all

9 Williams in the police interview, shortly before he cracks

Mr Wilson, a former prison governor, said: “Those kind of sexual deviancies have been present in your past for a very long period of time. What you see with Williams is almost a case book progression.

“He would steal women’s underwear, he would then start wearing that underwear, he would then break into homes in order to be able to steal that underwear, then photograph himself in that home whilst wearing the stolen underwear.

“He would then do home invasions whereby he would tie the women up until he is eventually committing murder.”

Williams, who was married to a respected businesswoman, began breaking into neighbours’ homes in 2007, stealing underwear and photographing himself.

9 Russell Williams was a trusted pilot for the Queen

9 Jessica Lloyd was brutally murdered by Russell Williams Credit: Nathan Denette

9 Marie-France Comeau was sexually assaulted and murdered by Williams Credit: Not known, clear with picture desk

In 2009 he went further, committing two sexual assaults.

Then, in November of that year, he broke into the home of Corporal Marie-France Comeau, who was under his command at Canadian Forces Base Trenton.

He subjected his employee to a brutal murder, recording the atrocity on video and with photographs.

Just two months later he killed his next victim, Jessica Lloyd, in a similarly gruesome execution.

Prof David Wilson praised cops for a "masterclass" in police work after Williams was brought in for questioning by Detective Sergeant Jim Smyth of the Ontario Provincial Police.

9 Colonel Russell Williams was a highly decorated pilot who flew the Queen and VIPs around the world. He was charged with two counts of first-degree murder in 2010 Credit: Reuters

9 Williams pleaded guilty on Monday to the murder of two women and a long list of sex crimes committed in the shadows of his decorated career Credit: Reuters

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The interview shows how Williams' confidence quickly deflates and he admits to the two murders.

“Over the course of 10 hours he is literally revealing to Williams the evidence that is going to tie him to the two murders," said Prof Wilson.

“You begin to see the tables turn in the course of the interview when you see the scales fall from Williams’s eyes and Smyth gets him to not only confess to the murders but also tell them where he has buried the body of Jessica.”

Williams is currently serving two concurrent life terms in a maximum-security prison in Port-Cartier in Quebec.

CBS Reality TV special Voice of a Killer – The Colonel, airs on Tuesday at 10pm.

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