Seems like heart attack. Coulda been from roids, but since he was a power lifter, before wrasslin, I couldn't blame his time in the ring for the heart attack. Wrasslin could be the reason for the Parkinson's though. Very stiff/rough style they work in Japan, where he spent the majority of his career. I could see chair shots and rough bumps damaging him enough to get da shakes.

Wiki days he and his wife ran a group home for abused boys in San Diego. I got a little more respect for him now.
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Thinking of cracked-out and/or tweaking whores getting their throats and asses brutalized for the next hit makes me hard. --Rear Admiral