Hi group. As the title says, my dads brother died earlier this year and after a few months of investigating his death has returned as unascertainable! He did smoke, a lot! But the pathologist states it wasn't thought to be his heart that was the cause (in the setting of myocardial infarction) as they would have visibly seen this in the form of scar tissue or heart muscle damage. He was 50 years of age and did not have any known seizure conditions and toxicology came back negative too. What does that leave then? Cardiac arrhythmia or a one off serious seizure?