Comics veteran Marc Silvestri explained the inclusion of the character in the upcoming movie at San Diego Comic-Con International.
"It just became more and more apparent as we were telling Jackie's story about The Darkness and the dark and light and how much they've intertwined over the years in the comic books," the Top Cow Productions CEO told MTV News.
"Jackie has that mob connection which we explore in the movie because it's an origin film. It makes sense to have a cop. And who do we know that's a cop in the Top Cow universe? Sara Pezzini, wielder of the Witchblade."
The film will centre around Jackie Estacado, the mafia hitman who inherits the deadly power called the Darkness from his father.
Total Recall director Len Wiseman will serve as a producer on The Darkness.