WALNUT CREEK — In the latest shocking development over a Sept. 18 double homicide, the suspect’s mistress has now been charged with breaking into the home where the brutal crimes took place in an effort to destroy evidence, court records show.

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Yan Wang, 45, was charged Monday with accessory to murders allegedly committed by her boyfriend, Howard Wang, 43, court records show. Now both are in Contra Costa jail cells, with Yan Wang’s bail set at $1 million. She was arrested and booked on Monday.

Howard Wang, of Walnut Creek, was arrested after he allegedly calling 911 on the night of Sept. 18 to tell police that he’d arrived home to catch a man stabbing his wife, Linlin Guo , 41, his mother-in-law Beimin Cheng, inside their home on Kelobra Court. He claimed he fired shots

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