Younger brother of Jerry Only, and guitarist for the Misfits from October 1980 until the demise of the original group in October 1983. He learned to play guitar from Jerry Only and Glenn Danzig at the age of thirteen. He was just 16 years old at the first show he played with the Misfits (Halloween 1980).
Doyle reformed the Misfits with Jerry Only in January 1995 and left the band in 2002.
Now currently playing in his solo project entitled Doyle with Alex Story of Cancer Slugs on vocals. He is currently married to Alissa White-Gluz, ex-The Agonist singer and current Arch Enemy vocalist.