i found a random dead alchemist in the middle of a small pool on top of a rock formation, right in front of a small waterfall. I think it was in the river to the west of rorikstead, seemed random to me.
I once met an alchemist in the wilds, but he asked me for my valuables like any other robber. He's still lying dead on the same road (was a pretty hard fight, he used magic when I was still a low level), moving a bit up or down the road every now and then.
He's on the road between Helgen and Riverwood, at least every time I've seen him. I don't think he's part of any quest, though.
I met him twice on the road between Whiterun and ... well ... Ivarstead? The road leading north around the mountain of High Hrotgar. Managed to take his staff, the guy would've poked someone's eye out with it!
I came across a dead fugitive, with a sabre cat nearby. No sign of the Hunter, though.
You can meet a lot of them when wandering across the Reach or on the mountains. Mostly groups of two dead npcs, killed by a wolf/sabre cat/troll/yadda yadda. Sometimes it's just "bosmer" or another race, instead of "fugitive".
Also, I've had three times now that when I run from Windhelm on the road leading west to that mill, a black horse comes falling down from the sky. The first time it fell in the river, the other two times it fell on the road, bounced up like it was on a trampoline and then dropped dead a bit farther. Really weird. O_o And it fell RIGHT NEXT to me the last time, I was shocked!
On the other hand, the travelling noble's horse doesn't feel like flying very fast from here to there and disappearing into the sky anymore, so I guess he finally learned his horse some manners ...