This happened to my best friend-- she was in her early 30ish, she was mildly overweight. She collapsed in her grad school class and was dead almost immediately

This happened to my best friend-- she was in her early 30ish, she was mildly overweight. She collapsed in her grad school class and was dead almost immediately from what I understand. Because of her age an autopsy was required-- which couldn't find any reason for the death other than it was a cardiac event.