Serial killer who was spared execution is killed in prison

Roger Kibbe. (Photo: California Department of Corrections and Rehabilitation)

A California serial killer known as the "I-5 Strangler" in the 1970s and 1980s has been killed in prison.

State correctional officials said Monday that a correctional officer spotted 81-year-old Roger Reece Kibbe unresponsive in his cell at Mule Creek State Prison after midnight Sunday. His cellmate was standing nearby.

Kibbe was initially convicted in 1991 of strangling a 17-year-old who had run away from home in Seattle. Investigators at the time said Kibbe was also a suspect in six other killings.

In 2009, a San Joaquin County District Attorney's Office investigator used new developments to connect him to the old slayings.