Macho Man - No Heart Attack

Apparently, it was not heart attacks, which lead to the death of Randy Poffo (Macho Man) as his completed autopsy revealed no extensive trauma noted to his body. Surely, a massive heart attack would lead to widespread damage to the heart muscle and possibly surrounding tissues, which would be easily identifiable during an autopsy. So, if it was not a heart attack, then what caused the Macho Man to lose control of his vehicle, which slammed into a tree?  Could this have been drug related and would it be a surprise?  Unfortunately, toxicology results are still out and are not expected for another four weeks.  I guess we will have to wait and see.