As a rule, staff NCOs don’t OD. Right now, since the there is no other explanation, I’m going to assume an aneurysm, one of those little pranks Nature likes to play.
Yup, people die from just being born. Just hope he was an honorable Marine. That would mean he served his Nation well in his short time on Earth and has a legacy his family can be proud of.
Could be gay interaction. Super violent mental illness.