What undead horse do i have in red dead redemption undead nightmare?

i accidentally tomahawked my undead horse in the head (i had Pestilence) think i tried to whistle for another horse and a message popped up and it said something along the lines of "Your whistle has attracted an undead steed...." the undead stead was red, but it wasn't war and it didnt have the attributes of the others.... which horse do i have then?