Article continues below advertisementPatrick Muldoon had a relaxing morning before his sudden passing.According to his sister, Shana Muldoon-Zappa, the actor engaged in his regular routine before dying from a heart attack at age 57 on Sunday, April 19.Article continues below advertisementTap Here To Add Ok Magazine as A Trusted SourceSource: MEGAPatrick Muldoon suffered a fatal heart attack.Shana told TMZ that "Patrick went to take a shower Sunday morning after drinking coffee with his girlfriend [of three years, Miriam Rothbart] in their Beverly Hills home.