Read on the RDR wikia site Death couldn't be acquired until after you've completed the game, but I got him near Las Hermanas just after getting the bate bombs from Ricketts. He also came with a deed (or blood pact).
When he runs there's some kinda white ghost after-effect and I'm wondering if that has something to do with the weird glitch-effect that makes his tail look cut in half.
Does all this sound right? Who else picked him up?
Ok I've just got Death and I haven't finished the game yet aswell but ive just too got the blood pack (horse deed) for completing his challenge and have no clue what it is. Also the ghostly stuff around him makes zombies heads explode when you run into or past them :)
Ok I've found out what the blood pack (horse deed) does (I think) if you open you bag when you press back it shows horse deeds to the four horses of the apocalypse, maybe we can use these to call our favourite horse?
I think Pestilence is in Tall Trees early on, War appears to be over by GaptoothRidge (found him just north of Gaptooth Breach), Famine I found to the NE of Perdido. And I think Death is available ONLY AFTER you have found the other 3. I randomly found Death on the North lip of Jorge's Gap (at 55%-60% complete), plus the last Apoca-Horse Challange (Rank 5) is to kill 1 of each type of Zombie class with the Death Horse itself.