Stu Kerr, 66, a veteran children's entertainer who was a frequent guest on TV's "Captain Kangaroo." Kerr began appearing on Baltimore television in 1952, where he worked as a weatherman and an announcer and wrote and performed in his own shows. He played a scatterbrained newsman called Mr. Scoop Toot on "Captain Kangaroo." His other characters included the zany Professor Kool, the conductor of "Caboose" and Commander Stukker of "54 Space Corps." Kerr got his start in broadcasting as a page at NBC in New York City, where he would pull old radio scripts from the trash and practice reading them. In Baltimore on July 17 of cancer.