Did he ever see a cardiologist during those years? I only ask bc you just mention endocrinologist. There are definite risk factors that increase with aas use. But it's hard to lock steroids in as a sole cause of a heart attack. He may or may not have had one regardless. Heart disease is the cause of around 25 percent of all deaths in the US. We all should do as much as we can to be aware of heart health.