The funeral mass for a dockworker killed in an accident May 15 at the Port of Los Angeles is set for next week in Long Beach, while his co-worker remains hospitalized after sustaining multiple injuries, according to the local longshoremen’s union.

The investigation into the accident by California’s Division of Occupational Safety and Health, meanwhile, will likely take months to complete, according to an official with that agency, commonly known as Cal/OSHA.

Santoyo and coworker Pedro Chavarin, maintenance workers at the Fenix Marine Services Terminal, on Pier 300, were changing a tire on a top loader when, witnesses said, a noise like an explosion reverberated across the grounds.

Santoyo “was fatally struck by an exploding tire,” according to the initial Cal/OSHA notification. The Los Angeles County Coroner ruled Santoyo’s death as an accident and the result of multiple traumatic injuries. Chavarin, meanwhile, was severely injured and has received multiple surgeries.

The early-morning incident, however, sent shock waves through the close-knit port community, with the International Longshore and Warehouse Union hosting its 17th annual memorial — honoring the founders of the union and all those who have lost their lives on the job — just hours after the accident.

Cal/OSHA is leading the investigation, which will try to determine the cause of the accident and identify any violations of workplace safety regulations, Frank Polizzi, the agency’s spokesman, said in an email Wednesday, May 22.

“By law, Cal/OSHA has six months to issue citations,” he said, “and investigations can take that long or at least a few months.”

Investigators will interview workers, the employer, supervisors and others, Polizzi wrote.

“They will review their safety training and maintenance procedures,” he added, “as well as any equipment and work area related to the accident.”

All Souls Cemetery will host a viewing for Jose Santoyo, 58, from 4 to 8 p.m. Monday, May 27, and his funeral at 9 a.m. the next day, according to a notice posted on one of the union’s social media sites. Chavarin remains hospitalized, a union official said.