Abstract: At approximately 11:00 a.m. on July 19, 2012, Employee #1 and two coworkers, employed by a construction company, were working on a residential construction project. Employee #1 was standing on a 1-inch by 4-inch catwalk while helping the two coworkers to bring down the old truss. The catwalk collapsed. Employee #1 fell approximately 8 feet 7 inches to the concrete slab below. He sustained serious injuries, multiple fractures to his left eye and right arm, that required more than 24 hours in-patient hospitalization. An employer representative reported this accident to Cal/OSHA's San Bernardino District Office at 4:00 p.m. on July 19, 2012. Investigation determined the cause of the accident was lack of assessment of hazards posed by the loose and existing catwalk.