New details regarding Patrick Muldoon's health prior to his untimely death have been revealed less than two weeks after his fatal heart attack. According to his death certificate exclusively obtained by Us Weekly on Wednesday, April 29, Muldoon's immediate cause of death was myocardial infarction, commonly known as a heart attack. The underlying causes included hereditary coagulopathy disorder, a genetic condition that impairs the blood's ability to form clots properly.