DNA Over Decades: A Look at How Police Tracked Down a Calgary Serial Killer

Alberta RCMP Supt. David Hall speaks about four homicides linked to Gary Allen Srery during a press conference in Edmonton, May 17, 2024. The Canadian Press/Jason Franson

The bodies of four girls and women were found outside Calgary in 1976 and 1977. For nearly 50 years, their killings were unsolved.

On May 17, RCMP identified Gary Allen Srery, an American sex offender, as the killer. He died in an Idaho prison in 2011.