Prosecutors said two of the victims managed to disarm Chong during a violent struggle.
Chong reportedly told investigators he opened fire over a dispute over work responsibilities at the camp.
Chong suffered severe head trauma in the fight. His arraignment was originally scheduled for April 15 in Murrieta, but it was postponed because he was not medically cleared to attend.
Chong's arraignment has been scheduled for May 1. He is being held on $1 million bail in a jail hospital.
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