It's kind of as it says on the title; in October or November 1945, just before he's due to return to Washington to replace George Marshall as Chief of Staff of the Army, Dwight Eisenhower is involved in a similar roadside collision as Patton OTL. He becomes paralyzed, and weakened by such, he dies from a respiratory infection in December.
Patton, of course, can go the same way, if you want; I don't see him getting presidential ambitions.
So... what happens next?