Thomas Patrick Leetch, production executive, died June 2 in Sherman Oaks after a long battle with leukemia. He was 60.Leetch began his career in the mid-1950s as a production assistant at Walt Disney Studios. By the early 1960s, Leetch was working as a first assistant on “Mary Poppins, “”Babes in Toyland” and “Son of Flubber.” He also worked as an assistant to Walt Disney on “The Happiest Millionaire.” Leetch served as a producer and director on numerous network TV shows before joining ITC Prods. as an executive production manager on miniseries and MOWs. Leetch served as the unit production manager for the first 16 episodes of “Northern Exposure.” He was a member of the Directors Guild of America, the Writers Guild of America and the Academy of Television Arts & Sciences. Survived by his mother, three daughters, a brother and three grandchildren.