You likely are thinking of the July 1997 slaying of Barbara Schultz, whose weighted body was found floating in a water-filled quarry about a week after her then 17-year-old son started driving her car around town and entertaining friends at their Rocklin home.
According to stories in The Bee, Steven “Matt” Schultz told friends that he intended to kill his mother. A day later, he struck 40-year-old Barbara Schultz with a baseball bat and used his hands and an extension cord to strangle her. Aided by friends, he then disposed of her body in the water-filled rock quarry.
Steven Schultz was convicted of murder and sentenced in 1999 to 26 years to life in state prison.
He was sentenced in 2010 to an additional 50 years to life after pleading guilty to first-degree murder in the 2008 death of Shannon Graling, a fellow prisoner at California State Prison, Sacramento. Authorities said Schultz was in the prison recreation yard when he approached Graling from behind and slit his throat with a box-cutter blade. Graling was a convicted child molester from the Santa Cruz area and was serving a 401-year prison sentence.
Schultz, now 34 years old, is incarcerated at Salinas Valley State Prison in Soledad.