Michael O'Hearn has appeared in the movies Barbarian , Keeper of Time , and had a minor supporting role in Death Becomes Her , as well as starred as Clark Kent / Superman in the popular Sandy Collora fan film World's Finest (opposite Clark Bartram as Batman ).  O'Hearn was also on the American Gladiators -like show Battle Dome from 1999 to 2001 where he played Michael O'Dell. On March 14, 2008, Michael made a guest appearance on the NBC soap opera Days of Our Lives , playing a bartender. On July 8, 2008, Michael made a guest appearance on NBC's Celebrity Family Feud as Titan with fellow Gladiators Wolf, Venom, and Jet.  On February 4, 2009 Michael made a guest appearance on NBC's Knight Rider , episode 14 as a cage fighter,  and in 2011 he appeared in a season 7 episode of It's Always Sunny In Philadelphia titled "How Mac got fat" as Mac's Avatar. In June 2011, Mike also played the part of "the bodybuilder" in season 1 episode 9 of Workaholics, "Muscle I'd Like To Flex".
Matarazzo's last appearance in a professional bodybuilding event was the 2001 Mr. Olympia, where he placed 21st.  He was forced to retire due to having open heart surgery on December 8, 2004 for clogged arteries. At the time of his death he was residing in Modesto, California , and  had been forced to stop working as a bail bondsman due to his 20% heart function.  On November 8, 2007, Matarazzo suffered a heart attack, his second cardiac-related problem since his surgery in December 2004.  On August 3rd, 2014, Matarazzo was in the intensive care unit of Stanford hospital in Palo Alto due to heart complications.   He died August 16 while awaiting a heart transplant.