Nina Myers is an antagonist from the first three seasons of 24. She is portrayed by Sarah Clarke.
Nina is introduced as one of Counter Terrorist Unit's top analysts, but is later revealed to be a mole inside CTU working for the Drazen family, assisting in their villainous plans in Season 1. She is later granted immunity for her traitorous deeds in Season 2.
In Season 3 she appears again when Jack Bauer is working undercover. Jack ends up shooting her to death as revenge for Nina killing his wife and unborn child at the end of Season 1.