Born in Buffalo, N.Y., Mr. Knapp was an amateur magician and performed every week for children at Tucson Medical Center and University Medical Center for 14 years.
Mr. Knapp was preceded in death by his daughter Marcia in 1978. Survivors include his wife of 56 years, Reva; children, Hersch Knapp of Los Angeles, and Debbie (Rick) Cahn of Oro Valley; and two grandchildren.
Services were held in Los Angeles. A memorial service will be held at a later date at Splendido, Oro Valley.
Memorial contributions may be made to the Jewish Federation of Southern Arizona, 3822 E. River Road, Tucson, AZ 85718.