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.