DI Kate Fleming is a fictional character from the British television series Line of Duty. She is portrayed by actress Vicky McClure and serves as a dedicated detective inspector in the police force. Known for her sharp investigative skills and determination, Kate often tackles complex cases involving police corruption and misconduct. Throughout the series, DI Fleming works closely with other key characters, including DS Steve Arnott and AC-12 team leader Ted Hastings. Her character is recognized for her strong moral compass and commitment to justice, making her a central figure in the show's gripping narrative.