WALNUT CREEK, CALIF. - The girlfriend of a man accused of killing his wife and mother-in-law in Walnut Creek has been charged as an accessory and with destroying evidence, prosecutors said.

Yan Wang, 45, of Oakland, is accused of helping her boyfriend, Howard Wang, 43, after he allegedly slashed the throats of his wife, Linlin Guo, and mother-in-law, Beimin Cheng.

The defendants both happen to have the same last name.

According to the Contra Costa County District Attorney’s Office, Yan Wang entered the home that Howard Wang owned with his wife with the intent to commit larceny. She is also accused of destroying cellphones to keep investigators from obtaining evidence.

She was arraigned on Tuesday on the charges.

Primary suspect’s arraignment ahead

What we know:

Howard Wang, who

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