"His co-worker was utilizing a forklift to place the beams onto the trailer bed," the Medical Examiner's Office said in a statement. "The beam being placed hit the previous stacked beams, causing three of them to fall off of the trailer bed and to the ground."
The falling I-beams struck Segundo and he was knocked to the ground, according to the Medical Examiner's Office.
Segundo had no pulse when paramedics and deputies arrived, but paramedics were able to restore a pulse before taking him to the emergency room at Scripps Mercy Hospital in Hillcrest, according to the Medical Examiner's Office. Doctors there were unable to revive him and he was pronounced dead in the hospital's trauma bay.
The cause of death was listed as blunt trauma.
The state Division of Occupational Safety and Health, or Cal/OSHA, will investigate the fatality, a process that can take up to six months, to determine if any workplace violations contributed to the accident, agency spokeswoman Jeanne-Mairie Duval said.