What helicopter is this in The Walking Dead?
(Source)

It is a UH-1 Huey.


  ... in the first episode of this sci-fi horror TV series about zombies in Atlanta, we see a pair of US army UH-1 Huey transports, painted with 'air cavalry' insignia, have been abandoned in a hospital car park.— rotaryaction.com


Looks like the main rotor has sunk down, should be higher up. Maybe a salvaged gearbox caused it to drop. Otherwise it's the same aircraft.