When George Romero died from lung cancer in 2017, he left behind several ideas and screenplays for zombie movies.

One was a treatment, “Twilight of the Dead,” and his widow, Suzanne Desrocher-Romero, described it as a “summing up” of the franchise, an ending to what began with “Night of the Living Dead” in 1968 and continued for five decades and six flesh-gnawing movies.

George Romero was the rare artist who invented a major modern monster, one whose popularity rivals that of vampires and ghosts. The popularity of the TV series “The Last of Us” or the highly anticipated arrival of a new entry in the “28 Days Later” series this month tells us that the zombie is not going to end anytime soon. Its whole thing, after all, is to keep coming back.

But what about the Romero zombie? The original strain. What will happen to this fabled creature now that its creator is gone?

Three women in the Romero family are grappling with their memories of him at the same time as they’re trying to answer this question. His director daughter, his producer ex-wife and his producer widow are each developing movies with a distinct vision of the future of the undead. They don’t exactly share the same vision even as they’re pressing forward. The Romero zombie is very much alive — and very messy.