Actor Ryan O’Neal’s cause of death has officially been revealed, roughly two weeks after he died at the age 82. The Academy Award-nominated “Love Story” star died of congestive heart failure, after years of suffering from cardiomyopathy, according to his death certificate obtained by The Blast. Cardiomyopathy is an overarching term for any disorder affecting the heart muscle, which causes it to lose the ability to effectively pump blood, according to Johns Hopkins Medicine.). Potential causes of cardiomyopathy include alcohol abuse, high blood pressure, coronary artery disease, viral infection…