Instagram/Denise Richards & Patrick Celebrity Denise Richards mourns Patrick Muldoon, her ex & lifelong friend, after his sudden death at 57. A tribute to their 36-year bond. April 22, 2026 AceShowbiz - Denise Richards has expressed profound sorrow following the unexpected passing of her former boyfriend and lifelong friend, Patrick Muldoon, who died at the age of 57. The actor, recognized for his roles in Starship Troopers, Days of Our Lives, and Melrose Place, reportedly suffered a fatal heart attack on Sunday.