Why did taraji p henson leave the show person of interest?

Taraji P. Henson left the show "Person of Interest" after its fourth season to pursue other opportunities and projects. Her character, Joss Carter, was written off the show in a dramatic storyline, which allowed the narrative to evolve and shift focus to other characters. Henson's departure was part of her broader career move as she sought to take on new roles and challenges in film and television.