Nearly every day there is a report of a young, fit individual, usually a man, who suffers unexplained sudden death now termed “sudden adult death syndrome.”  Because COVID-19 vaccination is highly prevalent and linked to the development of heart inflammation and myocarditis, it is a conservative and reasonable conclusion that unless otherwise ruled out, sudden adult death syndrome is a consequence of myocarditis.  The differential diagnosis could include other vaccine related serious adverse events including fatal pulmonary embolism, multisystem inflammatory disorder, and vaccine induced thrombocytopenic purpura.  Unlike sudden death, most of the other conditions give patients and doctors a chance at making a diagnosis, hospitalization, and treatment.   Because half or more of COVID-19 vaccine induced myocarditis is asymptomatic,[i] the first manifestation can be collapse due to an abnormal heart rhythm and unless promptly resuscitated, the pathway to death is rapid and final….