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.

Niznik grew up in Brewer, Maine, and was co-valedictorian of the Class of 1986 at John Bapst Memorial High School where she was an exchange student to Paris, participated in genetic research at Jackson Laboratory, and was a National Merit Scholar.

[4] 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 Vanishing Son and the 2007 drama Life Is Wild.

After retiring from acting in 2009, Niznik focused on volunteerism,[1] including involvement with organizations that helped children, the hungry, and animals.

[3] She died in Encino, California on June 23, 2019, at the age of 52,[3][5] from chronic liver disease and alcohol use.