Roger Kibbe An elderly California serial killer who was known as the "I-5 Strangler" has been killed in prison, authorities say.Mule Creek State Prison officials are investigating the death of inmate Roger Kibbe, 81, as a homicide.At approximately 12:40 a.m.
on Sunday, Feb. 28, a correctional officer was conducting an inmate count when they found Kibbe's cellmate standing in the cell and Kibbee unresponsive on the floor.Medical staff took Kibbe to the prison's health care facility but life-saving measures were unsuccessful.Get breaking news alerts in the FOX5NY News app.