“Melrose Place” star Patrick Muldoon’s official cause of death has been confirmed. The actor died from a myocardial infarction, known as a heart attack, according to documents obtained by Us Weekly Wednesday. Underlying causes of his death included hereditary coagulopathy disorder , which is a condition that causes impaired blood clotting, and pulmonary embolism , defined as “a sudden blockage in a lung artery.” Patrick Muldoon (pictured here on the set of “Melrose Place” in 1995) died from a heart attack. ©20thCentFox/Courtesy Everett Collection Muldoon (seen here in March) passed away following a suspected heart attack on April 19. Admedia Photo / SplashNews.com Muldoon passed away on April 19 . He was 57. The “Days of Our Lives” alum’s sister, Shana Muldoon-Zappa, told TMZ that her brother spent the morning with his partner, Miriam Rothbart, at their Beverly Hills home before stepping away to take a shower.…