From transcript of private investigator, Rich Hill’s, taped interview with John Miller:

Shaw: I believe when they found his car up on the hill in Lockwood the radio was going, fuzz music. He had the passenger door locked. I think he had only one round in a two round shot gun – one round was already shot off – and he shot himself with the other bullet ... The radio was on a crazy fuzzed out station or something. Passenger door was locked.