My 48 year old sister-in-law, no pre-existing co-morbidities, good health, no family history of heart attacks, both parents still alive in their upper 70s, had a heart attack about 2.5 weeks after getting the shot.
She was saved by her dog. Was at night, husband was away on biz. She fell out of bed, the dog noticed and started freaking out, woke up the girls in the basement, who were able to call 911.
SIL lived, and seems to have recovered reasonably well. She will not allow her daughters to get the shot, and is mad that she ever got it.
Pets are wonderful!