I'm close to someone who has it, and I have to admit that my first response was also: "uh, what?". However it can happen. I guess my main reason for believing

I'm close to someone who has it, and I have to admit that my first response was also: "uh, what?". However it can happen. I guess my main reason for believing it is that I can think of many more plausible sudden death explanations. Drug overdose, accident, aneurism, heart defect, these can all kill without warning. So why come up with a cover story that isn't plausible?