Doyle is the younger brother of Jerry Only, and the two are famed for playing together in the horror punk band Misfits.
He married Stephanie Bellars (Gorgeous George) on September 1, 2001. They have a daughter, Boriss. They later divorced and as of early 2014 he was dating Alissa White-Gluz.
In recent years Doyle has patched up his differences with former Misfits bandmate Glenn Danzig - Danzig produced Gorgeous Frankenstein's debut album and Doyle has appeared onstage to play Misfits songs at Danzig gigs.