Presumably, Adolf Hitler's life would have been very similar to his Earth-616 counterpart before the outbreak of the zombie infection.

Towards the end of World War II, the Nazis plans seemed in jeopardy, so Hitler decided to look to the forebears of the Aryan race for help, the Norse gods themselves. Hitler sent Baron von Strucker to Tibet to find the Rainbow Bridge to Asgard. What Strucker found there, however, was the Death Spore Flower, plucked from the viking underworld of Hel. Strucker returned to Hitler with the flower, which he ate, beginning the zombie outbreak.[1] By infecting the rest of the planet with the zombie outbreak, Hitler and the Nazis managed to take over Earth-12591 and next set their sights on the other Earths of the Multiverse. It stands to reason that Hitler would have been killed along with the rest of the zombies by the atomic bomb that Miss America launched at their headquarters, though this has not been proven.