Arthur Suydam, who has painted all those wonderful Marvel Zombies covers as parodies of classic Marvel covers, was commissioned by Wizard Magazine to make his first DC Zombies cover. He produced the zombie version of the cover to Crisis on Infinite Earths #7, featuring the death of Supergirl (with a bunch of Legionnaires in the background). The result appears on Wizard's web site (and maybe even in their magazine too).
Ironically, the only live person on this cover is Supergirl. (Click to embiggen)