The term "walker" is used rather than "zombie" in the Walking Dead universe because films
like George Romero's Night of the Living Dead and the concept of zombies do not exist in
their pop culture.
Too bad, because they have to figure out the whole destroy the brain thing on their own.
Though they don't need to breathe, or have all the pieces of their respiratory system,
Walkers have an acute sense of smell.
Before collaborating with Telltale Games, Robert Kirkman, the creator of the Walking
dead comic, had played Strong Bad's Cool Game for Attractive People, and became interested
in creating a Walking Dead game because he enjoyed Telltale's ability to create an engaging
narrative.