PORT Elizabeth police said they will not prosecute a couple who attacked and killed an intruder in their home on a smallholding outside the city. The armed man entered the house of Brian Knox, 50, and his wife, Anne-Marie, 47, while they were having dinner, and confronted them. Mr Knox apparently grabbed the man and during an ensuing scuffle his wife stabbed the would-be robber with a kitchen knife. He later died in Port Elizabeth’s Livingstone hospital.