I didn't know that Cat's Eye was in the same universe as City Hunter but all the series here are from the same writer, Tsukasa Hojo. From the Cat's Eye wiki:
In contrast to Angel Heart (which is set in alternate universe, despite sharing City Hunter characters), both Cat's Eye and City Hunter series are set in same universe. The titular City Hunter character, Ryo Saeba, is acquaintanced with them. He also has rivalry with them because he was helping police capture Cat's Eye. Despite their rivalry, they have great teamwork fighting against criminals. The sisters come to Ryo's rescue in City Hunter the Movie: Shinjuku Private Eyes when Ryo has trouble defeating his enemy.
"The Night of the Undead" doesn't belong on this list as it doesn't have zombies, a pandemic nor is the apocalypse happening, just aliens. I think the title refers to characters appearing to have gotten killed but then coming back.
