If he died in Utah he can go to the Bureau of Vital records
Health.Utah.gov/vitalrecord. They should be able to help him and tell him what he needs to do. 801-538-6105 is a recorded message so I'm not sure where that will send him. I do think he will need a death certificate. He might also contact the mortuary that buried him. They are supposed to give the family copies of the death certificate.