Jack has lost his wife Teri, murdered by a traitor who had infiltrated CTU. His relationship with his daughter Kim is at times tumultuous (Season 2, Season 5) while at other times accepting of who he is and what he must do (Season 7, Season 8). In his goal to find peace, he gets involved with Audrey Raines, the daughter of Secretary of Defense Heller, whom Jack works for. The relationship with the Secretary's daughter is all but severed when Jack makes the decision to save a material witness over Audrey's ex-husband. He lost his best friend, Tony Almeida, and former boss, Michelle, to a car bomb. He lost his friend, former President Palmer, to the same assassin who killed his friends. His girlfriend Renee Walker was killed by an assassin's bullet. His own government that he has sworn to protect has turned on him (former President Logan, President Taylor), and at the beginning of Season 7 he is on trial for his interrogation tactics. Finally, the friend he thought was dead (Tony Almeida), betrays him when he turns to terrorism in order to seek revenge against the person who killed his wife, Michelle.