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

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. Here’s a look at the police investigation: Feb. 12, 1976: Eva Dvorak and Patsy McQueen, both 14, leave Ian Bazalgette Junior High School. They remain together for the next couple of days and visit the homes of various friends. McQueen’s family reports her missing. Feb. 15, 1976: The bodies of the two girls are found on a road beneath an overpass west of Calgary. They are fully clothed, but police believe they were sexually assaulted....