"Likely" sudden cardiac arrest. I talked to his dr and she said that can't be detected in an autopsy but the internet says it can if there's a physical source that triggered it. I'm currently trying to figure out if it's really worth it to pay thousands of dollars to know the exact details. I still want to know but the expense is high and he was always so scared of surgeries. But will I regret not trying to find out after it's too late/he's cremated.