system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What does it mean to die of "natural causes"?
gpt
It basically means they weren't killed by some external agent, like a bullet, car accident or drug overdose.

There are many ways you can die of natural causes, heart attack, stroke, pneumonia.  It just means something else didn't kill you.  And if someone is elderly and there is no sign of anything else, they aren't going to look very hard.