California police have apprehended the girlfriend of a murder suspect following her break-in at the scene where he allegedly killed his wife and mother-in-law to eliminate evidence.

The Contra Costa County District Attorney’s Office announced the arrest of 45-year-old Yan Wang on charges of accessory after the fact, residential burglary, and evidence tampering. Authorities claim she had a romantic involvement with 43-year-old Howard Wang (no familial relation), the man suspected of murdering his wife, Linlin Guo, and his mother-in-law, Beimin Cheng.

Law enforcement responded to a potential shooting at a residence on the 100 block of Kelobra Court in Walnut Creek around 11:45 p.m. on September 18. Upon arrival, officers discovered the deceased bodies of Guo and Cheng. Detectives subsequently identified Howard Wang as the murder suspect and detained him.

Yan Wang is alleged to have tried assisting her boyfriend in evading arrest, trial, conviction, and punishment for the murders. She faces accusations of destroying cellphones to obstruct evidence discovery and breaking into the home shared by Howard Wang and Guo with “intent to commit larceny” the day following the deaths.

Officials arrested her on September 24 near her residence in Oakland and formally charged her on Monday. Both suspects remain in the Contra Costa County Jail without bail, with a court appearance scheduled for Friday.

Authorities disclose that the murder suspect had threatened his wife’s life in August 2024 and stopped her from reporting a crime to police on January 7, 2023. Details regarding these claims and a motive for the killings remain undisclosed by officials.

Local Fox affiliate KTVU reported that at Howard Wang’s first appearance, there was a physical altercation between Yan Wang and Linlin Guo’s family members after the defendant’s mistress showed up in court. The station, citing court documents, also said that Howard Wang filed for divorce in January 2024 but sought to have the matter dismissed months later.

“This case serves as a sobering reminder of domestic violence’s far-reaching consequences,” Contra Costa District Attorney Diana Becton said in a statement. “Our office will pursue justice with the seriousness and urgency this tragedy demands.”