LOS ANGELES -- Bumble Bee Foods and two managers were charged by Los Angeles prosecutors Monday with violating safety regulations in the death of a worker who was cooked in an industrial oven with tons of tuna.

Jose Melena was performing maintenance in a 35-foot-long oven at the company's Santa Fe Springs plant before dawn Oct. 11, 2012, when a co-worker, who mistakenly believed Melena was in the bathroom, filled the pressure cooker with 12,000 pounds of canned tuna and it was turned on.

When a supervisor noticed Melena, 62, was missing, an announcement was made on the intercom and employees searched for him in the facility and parking lot, according to a report by the California Division of Occupational Safety and Health. His body was found two hours later after the pressure cooker, which reached a temperature of 270 degrees, was turned off and opened.

The body was severely burned, reports CBS Los Angeles. The oven is used to sterilize cans of tuna, the station says.