According to TMZ, Muldoon died of a heart attack and paramedics were called after his girlfriend found him unconscious in their Beverly Hills home.

From 1992 to 1995, Muldoon originated the role of Austin Reed on the daytime soap opera “Days of Our Lives.” He returned to the soap to reprise the role from 2011 to 2012.

Muldoon was also an active producer, working on a slew of movies including “The Tribes of Palos Verdes,” “Arkansas,” “Marlowe,” “The Card Counter,” “The Dreadful” and “Riff Raff” through his Storyboard Productions. He was set to produce the upcoming feature “Kockroach,” starring Chris Hemsworth. Just two days ago, Muldoon posted on Instagram: “So excited to be a part of this amazing project KOCKROACH directed by Matt Ross starring Chris Hemsworth, Taron Edgerton, Zazzie Beetz and Alec Baldwin.” The production is currently filming in Australia.

Muldoon’s “Days of Our Lives” co-star Alison Sweeney paid tribute: “This is such heartbreaking news. Pat was a rare kind of person—brilliantly talented, endlessly kind, and generous in spirit. I was so lucky to have worked with him when I first started at Days, he made me feel at ease right away. He brought his unique charm and humor to work every day. A truly gifted guy, and one who will be profoundly missed.”