“Can a person be scared to death?”

Strong positive or negative emotions— ecstasy,grief, excitement—can lead to sudden cardiac death via ventricular fibrillation (irregular heartbeat), as in the case ofpeople who have died during sexual intercourse or when frightened. Or when frightened during sexual intercourse,which happens more often than you might think.
Coco Ballantyne, Scientific American, January 30, 2009.