Maybe Art hired the stalker and shooter. He was not above pushing a conspiracy theory.
Just postulating here, but didn’t it transpire that him and some of his ham radio buddies would plan some of the more famous calls, like Bugs and possibly even Mel’s hole? (I still love those calls, it was the entertainment value for me not the veracity of it)
Something like a vague stalkery type thing would be even easier to arrange?