Katherine Anne Austen, more commonly known as Kate, was one of the survivors from the crash of Oceanic Flight 815. Before the crash, Kate spent years fleeing the law after killing her abusive father. To achieve her goals, she would commit several other crimes and would turn to bank robbery, assault and seduction.
On the Island, she became an integral member of the survivors’ society, forming strong bonds with Jack and Sawyer and also becoming close with Claire and Sun. Resourceful, quick-witted and mysteriously reclusive, she participated in many missions while attempting to hide her troubled past from the rest of the survivors.
Kate was captured by the Others along with Jack and Sawyer, but she eventually escaped the Island with five other survivors. Kate went on trial for her various crimes and accepted a ten-year probation order. She was briefly engaged to Jack, but his drug and alcohol problems ended their relationship. She also raised Aaron Littleton as her son, but she finally decided to return to the island to rescue his mother, Claire.
Once she returned to the Island, Kate was stranded in 1977 with the other survivors. She worked for the DHARMA Initiative and saved a young Benjamin Linus’s life. She then time-traveled to 2007, where she found an “infected” Claire. Kate joined the Man in Black’s side, but she did not trust him. She helped Jack to kill the Man in Black and then escaped the island with Claire. Jack and Kate were reunited in the afterlife and moved on with their friends.