Authorities say Stacy Knappenberger was found dead in her home in the 5300 block of South J Street in Oxnard on July 30, 1980. She had multiple stab wounds, and investigators also believed she had been sexually assaulted.
The Oxnard Police Department conducted an extensive investigation, but was unable to make an arrest. The case was re-examined in 2000, and then two years later, a DNA match identified Thomas Young as the suspect.
Young was taken into custody on Thursday and was booked at the Jefferson County Jail. He is currently awaiting extradition to Ventura County.
Anyone with information about the case is urged to call Ventura County Crime Stoppers at (800) 222-8477.