Patrick Muldoon, a prolific actor who starred in TV shows Days of Our Lives and Melrose Place, among others, died on Sunday. He was 57. His manager confirmed the news to Variety. Muldoon, who also starred in the movie Starship Troopers, died suddenly following a heart attack, according to Deadline.Muldoon's sister, Shana Muldoon-Zappa, told TMZ that he had spent Sunday morning with his partner, Miriam Rothbart, in their Beverly Hills home. Rothbart had reportedly checked on Muldoon after he went to take a shower and found him unconscious on the bathroom floor.