Board Thread:Warhammer 40k General Discussion/@comment-66.206.224.153-20140125034337/@comment-24944355-20140816084126

I'm fairly sure he's dead, in Scars he continuously has a precognitive dream of him fighting an immensely tall figure of darkness on a gray plain under a black sky and being killed. The Khan saw this as a wind dream of his death & considering how the rest of the book ended up I believe that the dark giant was demon prince Mortarion & that the Khan was ambushed after entering the webway and killed by Mortarion.

There is one slight chance of Jaghatai Khan still living if the vision of his death at Mortarion's hands is to come after the return of the primarchs, but I think it unlikely.