The living dead, popularly know as zombies as we all know are fictional dead characters reanimated from the dead. Zombies were the brilliant work of George Romero, who first introduced the idea in The Night of the Living Dead movie of 1968, followed by Dawn of the Dead in 1978. It took the world by surprise. It was unlike anything before.
Zombies are most commonly found in horror and fantasy genres, but recent times show otherwise. The Zombie idea has been abused so much that movies on zombies hardly scares anymore. I've even seen a zombie movie where the undead smokes cigarrettes and strategises their plans before attacking humans, no jokes.
There's this seasonal movie titled living dead, I don't know if your question is also referring it. If so, the series are great. I've seen probably upto 5 seasons so far and they've met my expectations.