Man sentenced to 16 years to life for murder of girlfriend’s mother

A Long Beach judge on Tuesday sentenced a man to 16 years to life in prison for stabbing his longtime girlfriend’s mother to death in 2016.

Prosecutors said Luis Jimenez, 35, stabbed 68-year-old Margarita Valdez Castro 11 times on May 21, 2016 while his unsuspecting girlfriend and their kids waited for him in the car outside.

He left with the family to a school event after and Castro was later found dead in her home.

A jury found Jimenez guilty of second-degree murder with a knife-use allegation in August.

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Valerie Osier is a breaking news and crime reporter for the Long Beach Post. She’s a Riverside native who found her love for journalism while at community college. She graduated from Cal State University, Long Beach journalism program in 2017 and covered the Palos Verdes Peninsula for the Daily Breeze prior to coming to the Post. She lives in Long Beach with her husband, Steven, and her cat/child, Jones.