SAN JOSE, Calif.—A Silicon Valley engineer charged with fatally shooting three former co-workers has testified that being fired from his job made him go insane.

Jing Hua Wu took the stand in his murder trial Tuesday and said he was under enormous stress leading up to the day he gunned down three executives at the semiconductor firm SiPort Inc. in November 2008. Wu has pleaded not guilty by reason of insanity. He faces life in prison without parole if convicted.

After being fired, prosecutors said Wu returned to his workplace and committed first-degree murder because he planned the killings.

The San Jose Mercury News reports (http://bit.ly/11UUti3) Wu pleaded with the company's chief executive to retain him for three months or else he'd go bankrupt.


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