Muldoon's manager confirmed his death to Variety, and Deadline reported it followed a heart attack. Costars including Alison Sweeney and Lisa Rinna paid tribute, while Richards' daughter Lola Sheen shared a touching message about how much he meant to their family.
Muldoon was known for Austin Reed on Days of Our Lives (1992–1995) and Richard Hart on Melrose Place through 1996. He and Richards also appear in the crime thriller Dirty Hands, set for digital release April 24; his final red carpet appearance was at the Saturn Awards on March 8.