After the Horsemen is set way after the apocalypse and are quite generic, they don't include rules for zombies, just largely human on human, they are true 'Post-Apocalypse' rules in that sense.
All Things Zombie:Final Fade Out will take you from Day 1 though and the supplements even further. You could create a 'Star' that has some of the attributes of an 'Alice', but the game is a bit more 'real' than that in essence. Wargames Emporium did stock the older ATZ rules, but I'm not sure about these as they are the latest and last edition of the rules.
Ed at Two Hour Wargames is the first port of call about the rules though, he's a nice guy and will answer queries.
Ditto Brummie's suggestion about the Board of the Living Dead... in lieu of Vampifan being around at present, try viewing
his blog, it will keep you out of mischief for a while!
