KTTU is a full-service television station in Tucson, Arizona, broadcasting digitally on UHF channel 19 (18.1) as a MyNetworkTV affiliate. Founded March 21, 1983, the station is owned by Tucker Operating Co., LLC, and is operated under a shared services agreement by Raycom Media. KTTU carries MyNetwork TV programming during its prime time hours, and may carry Fox network programs when preempted by KMSB in the event of a local special or an emergency such as a breaking news story.