George Romero, whose classic “Night of the Living Dead” and other horror films turned zombie movies into social commentaries and who saw his flesh-devouring undead spawn countless imitators, remakes and homages, has died. He was 77. …

Romero is credited with reinventing the movie zombie with his directorial debut, the 1968 cult classic, “Night of the Living Dead.” The movie set the rules imitators lived by: Zombies move slowly, lust for human flesh and can only be killed when shot in the head. If a zombie bites a human, the person dies and returns as a zombie.

Romero’s zombies, however, were always more than mere cannibals. They were metaphors for conformity, racism, mall culture, militarism, class differences and other social ills.