For Athletes, I'm kind of shocked no one said this (or I missed it).. Will Smith. Just pure senseless violence. I was P'Oed for a while. Still get upset when I think about it too much.
Otherwise, I'm only 39 and have already seen too many friends my age die. Suicide, accidents. A cousin that was murdered years ago. Those hit me harder. Especially the ones with kids, and seeing the damage left behind.