Delores Diamond (born Maryann Miller) is a programmer for the Children of the Divine cult. She was directed by leader Mother Shelby into drugging kids in their cult, including Shelby’s own children, and preparing them for rape by the adults. She also trained them to rape each other, even blood relatives.
Diamond was killed by one of Shelby’s sons, Richard Ranson / Daniel Shelby, in an attempt to find Mother Shelby and kill her too. Ranson failed his attempt at committing suicide. His testimony would successfully secure Mother Shelby’s conviction. (L&O: "Sects")