Jenna Marshall is a fictional character created by Sara Shepard for the Pretty Little Liars book series, and later developed for the Freeform television series adaptation by I. Marlene King and portrayed by Tammin Sursok. Jenna is one of the main antagonists in the books and TV show; her blindness is a result of a prank orchestrated by Alison DiLaurentis, making it the Liars' main and most deadly secret. Although in the books Jenna is murdered in Wanted, in the show she is still alive.