(Born Dec. 10, 1952) Susan Dey is an American actress, known primarily for her roles in movies, soap operas and television. Susan Dey is best known for her roles as Laurie Partridge, on the 1970s sitcom, The Partridge Family, and as a California assistant district attorney named Grace Van Owen, on the 1980s drama, L.A. Law (a role she played from 1986 to 1992).