​From Wikipedia, the free encyclopedia Stephanie Lynne Niznik (May 20, 1967 - June 23, 2019) was an American film, television, and theatre actress most famous for her role as Nina Feeney on Everwood. Besides Everwood, Niznik's television roles include guest roles on Dr. Quinn, Medicine Woman, Profiler, Sliders, JAG, Frasier, Epoch, Star Trek: Enterprise, Traveler, and Diagnosis: Murder, in addition to being a series regular on the mid-1990s action drama... see more