The mistress of a Walnut Creek man charged with murdering his wife and mother-in-law earlier this month has been charged with helping to cover up the crimes and destroy evidence, prosecutors said Tuesday.

The killings happened on Sept. 18 at a home on Kelobra Court near Ygnacio Valley Road. Authorities said 43-year-old Howard Wang slashed the throats of his wife, Linlin Guo, and his mother-in-law, Beimin Cheng, and falsely claimed he arrived home and shot at a fleeing intruder responsible for the killings.

Walnut Creek police on the scene investigating a double homicde at a home on Kelobra Court on Sep. 18, 2025. CBS

The Contra Costa County District Attorney's Office said Tuesday in a press release that 45-year-old Yan Wang, who shares the same last name as the murder suspect b

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