Not just uncaught murderers, there are a lot of people who have killed without legally being considered murderers.
People who killed people in accidents such as driving accidents or hunting accidents
People who killed in self defense
Soldiers who killed enemy soldiers
Executioners
Police officers who have killed on duty
Doctors and nurses who have made mistakes that accidentally killed patients


I wonder how many people who have themselves unknowingly caused a death, though some thoughtless or innocuous action. E.g. a discarded banana peel causes another person to later slip and fall with a fatal result.
the number of people who fall into this category through their use of stock LED headlights is non-zero
There’s an early Robot Chicken bit where he dies and asks silly questions to a book that can give him an answer like how many times did I listen to this song, or how much of a wall could my poop make. This question sounds like an interesting one to ask that book though. Actually I’d probably prefer not to know the chaotic randomness that is our lives but guess the lives part would be redundant at that point anyways.
I frequently have this thought, but take it one step further. Like, what if something I did, intentionally or not, greatly angers or pisses off someone that they get riled up, and it leads to them having a heart attack or lashing out in a way that causes them mortal harm?
Am I wholly responsible? No. But am I somewhat indirectly involved in their demise? Debatable. Yes, it gets very convoluted quickly, but it’s something that pops up in my head whenever I’ve got some idle time.
You are not responsible. Even if you argued with someone, you couldn’t have known what the outcome would be. Heart attack or they spent a bunch of time pissed and got in a fistfight later that resulted in someone’s death. You cannot control what they choose to do as long as your actions weren’t intentionally leading the other person to make those choices.