* Domenic (John) Viotti; Child Star, Jazz Pianist, Clown

Domenic (John) Viotti, 61, former child actor, jazz pianist and clown who appeared in films with the comedy team of Abbott and Costello. Viotti began his career at age 5, when he appeared in advertisements for Skippy peanut butter. As a teen-ager, he became a jazz pianist and worked as a clown. He worked with comedians Bob Hope and Red Skelton, band leader Les Brown, and singers Sarah Vaughn and Nancy Wilson. In 1974, he moved to Yakima, Wash., and opened a restaurant called the Kitchen, while continuing to perform as a clown and with a jazz group. On Tuesday in Yakima of a stroke.