who shot dexter's sister in season 4
Arthur Mitchell (character) Mitchell lives with his wife, Sally, and his teenaged children, Jonah and Rebecca. He has another, older daughter by a previous relationship: Christine Hill, who witnessed one of his murders as a child. He treats her like a shameful secret, forbidding her from contacting him and keeping her existence hidden from his other family. She tries unsuccessfully to win his love, going so far as to commit murder for him; she kills FBI agent Frank Lundy and wounds Dexter's adopted sister Debra to protect her father from the police.[3] Her actions have the opposite of the intended effect, however: When he learns what she has done, Mitchell tells her he wishes she had never been born. She commits suicide shortly afterward.[4]