In 1975, a rebellious teen enlists her boyfriend to kill her parents in a small, Northern California town. The gruesome crime would be dubbed "The Barbecue Murders" in the press.
Sources:
"Kill My Parents: The story of Marlene Olive" by Denise Noe for Crime Library, June 23, 2014
"A Local Murder: Terra Linda was the setting for a real-life 1975 crime" by Jim Wood for Marin Magazine, October 21, 2008