Former U.S. President David Palmer is assassinated in Los Angeles, California and Jack Bauer is framed for his murder. The assassins also plan to frame Jack for murders of Tony Almeida, Michelle Dessler and Chloe O'Brian, all of whom helped Jack fake his death. Michelle is killed and Tony is critically injured but Jack manages to save Chloe. After investigating David Palmer's death, Jack goes looking for further information at LA/Ontario International Airport which is subsequently attacked by terrorists.