Article continues below advertisementDenise Richards faces an emotional upheaval following the sudden death of her ex-boyfriend Patrick Muldoon. The actor, known for his role in Days of Our Lives, died unexpectedly on Sunday from a heart attack at the age of 57.Article continues below advertisementSources claim that Richards is heartbroken."She's devastated. Really, really sad," a source dished. "I'd even call her inconsolable. She can't stop crying."Richards, now 55, dated Muldoon for nearly five years during the late '90s and has known him since her teenage years.