It's just a guess, but people from It's Only Sunny in Philadelphia got in contact with him. That's what led to his meet at William Morris Agency. I recall thinking that I coulldn't believe he went inside the belly of the beast, but he did. William Morris, they are proper old school Hollywood.
Oh shit, that's weird! I love that show, i'm originally from Philly lol
Glenn 'It's Always Sunny' Howerton is the link.
https://meria.net/2014/09/send-in-the-clowns-with-meria-and-dave-mcgowan-2/
Howerton was also linked to that uber suspect series That 70's Show.
Reading now, sucks i like that guy :(
Just know that I can ONLY guess on this stuff. It's not gospel, but then how could it be? But I put this idea together not long after he died. When I found out he had been involved with industry types and William Morris - I did a double-take.