* K. T. Stevens, 74, a theater, film and television actress and theatrical-union official, died of lung cancer June 13 at her home in Brentwood, Calif. Ms. Stevens, the former wife of film actor Hugh Marlowe, played leading roles in such films as "Address Unknown" (1944), and "Vice Squad" (1953). More recently, she appeared in "Bob & Carol & Ted & Alice" (1969). Her television credits include appearances on several soap operas.