WALNUT CREEK, Calif. - A man has been charged with double murder in the stabbing deaths of his wife and her mother in Walnut Creek .

"We have a family that's now shattered, and we also have a community that is grieving, and so we join in that grieving," said Contra Costa County District Attorney Diana Becton.

Twin girls home at time of Walnut Creek double slaying

What we know:

It happened Thursday night at a home on Kelobra Court. KVU has learned authorities believe Howard Wang, 43, slashed the throats of his wife, Linlin Guo and mother-in-law Beimin Cheng. Sources say he then fired two shots from a 9mm handgun and falsely claimed he had shot at a fleeing intruder responsible for the killings.

KTVU has also learned the couple's 8-year-old twin daughters were home at the time.

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