Col Russell Williams (photo, from bbcimg.co.uk) has been given a life sentence with no chance of parole for 25 years for two murders and sexual assaults.
Canadian air force officer Williams, who once acted as pilot for Queen Elizabeth II, pleaded guilty to the murder of Marie Comeau, 38, and Jessica Lloyd, 27.
With tears in his eyes he told the court that he had committed “despicable crimes”.
Williams also carried out sexual assaults on two other women.
He pleaded guilty to two counts of first-degree murder, two sexual assaults and 82 counts of breaking-and-entering.
The former pilot also admitted a string of burglaries, in which he stole women’s underwear.
Williams took pictures of himself wearing the underwear in the women’s bedrooms. He stored the photographs he took on a computer hard drive.
During most of the proceedings in the Canadian courtroom, Williams sat looking down. Before sentencing he was given a chance to address the court.
“I deeply regret what I have done and the harm I know I have caused. I’ve committed despicable crimes,” he said, while crying.
Ontario Superior Court Justice Robert Scott described the 47-year-old as a “sick and dangerous man”.
“Russell Williams will forever be remembered as a sadosexual serial killer,” Mr Scott said.
“The depths of the depravity shown by Russell Williams have no equal.”
Williams admitted he had betrayed family and friends, as well as colleagues in the Canadian armed forces and said he would spend the rest of his life regretting that he had ended “two vibrant and cherished lives”.
It was explained to the court how Williams had videotaped and photographed sexual assaults on his two victims before killing them.
Williams had been a rising star in the Canadian air force and was in charge of Base Trenton in Ontario, the country’s busiest air force hub.
Since 2007 he burgled at least 47 homes, most of them in the same street. One home was burgled nine times.
In February he was arrested for the murder of Ms Lloyd, who had been spotted by the colonel as he drove on a road near a cottage he owned.
Later he was charged with the murder of Ms Comeau, committed in November 2009. Williams had targeted her after meeting her as she worked on a military flight.
The military has been “deeply shaken” by Williams’s actions, said Lt Gen Andre Deschamps, the Chief of Air Staff for the Canadian military.
Lt Gen Deschamps said the military could now fire Williams and take away any medals he had been awarded.
“We don’t understand why,” he said. “This individual was a man of tremendous capacities. He was professional. I still can’t reconcile the two people we’ve seen.”