Patrick Muldoon’s cause of death has been revealed.

The Melrose Place alum died of myocardial infarction, commonly known as a heart attack, on April 19, according to the death certificate viewed by PEOPLE.

The document lists pulmonary embolism and hereditary coagulopathy as underlying causes. Coagulopathy is a genetic condition that involves problems with how the body forms blood clots. A pulmonary embolism is a blood clot that prevents blood flow to an artery in the lung, according to the Mayo Clinic.

Muldoon’s remains were cremated on Tuesday, April 28, according to the death certificate. The document lists his occupation as an actor and producer.

Muldoon’s manager previously confirmed his death in a statement to Variety, sharing that the Days of Our Lives actor died suddenly on Sunday, April 19. His sudden death came following a heart attack, Deadline reported at the time. PEOPLE reached out to a representative for Muldoon for comment.

The actor shared a post on Instagram two days before his death, writing that he was excited about his new crime thriller Kockroach, starring Chris Hemsworth and Taron Egerton. Muldoon was credited as an executive producer on the project.

“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,” Muldoon wrote in the caption.

Muldoon most notably played Austin Reed on Days of Our Lives from 1992 to 1995, before reprising his role after a 16-year hiatus in 2011. He also starred as Richard Hart in Melrose Place for three seasons until 1996. Other notable works included a three-episode stint on Saved by the Bell and his performance as Zander Barcalow in the 1997 cult classic Starship Troopers.

Several former costars paid tribute to Muldoon on social media following news of his death, including Days costars Alison Sweeney and Lisa Rinna. Rinna, who played his on-screen sister Billie Reed, shared a picture of the pair with a broken-heart emoji on her Instagram Stories.

Sweeney, who played Samantha “Sami” Brady on the soap since 1993, reflected on the “heartbreaking news” in a post shared on X.

“Pat was a rare kind of person—brilliantly talented, endlessly kind, and generous in spirit,” Sweeney, 49, wrote. “I was so lucky to have worked with him when I first started at Days, he made me feel at ease right away.”

She added, “He brought his unique charm and humor to work every day. A truly gifted guy, and one who will be profoundly missed.”

Muldoon is survived by his partner, Miriam Rothbart, along with his parents, Deanna and Patrick Muldoon Sr.; his sister and brother-in-law Shana and Ahmet Zappa; niece Halo and nephew Arrow Zappa, per Variety.