A Silicon Valley engineer has been arraigned on first-degree murder charges alleging he killed three colleagues after being fired.

Jing Hua Wu, 47, did not enter a plea in court Wednesday.

Public defender Michael Ogul says his client is "sad and distraught about the situation."

The charges against him include the special circumstance of killing multiple people. That allows a possible death sentence, although prosecutors have not said whether they plan to pursue it.

Police say Wu shot three executives Friday afternoon at SiPort Inc., the semiconductor firm that had fired him earlier that day.

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