Niznik is best known for her role as helpful neighbor Nina Feeney in "Everwood", which she played from 2002 to the end of the series in 2006 (four seasons).
Stephanie Niznik additionally starred on standard TV exhibits like Gray's Anatomy, Life is Wild, CSI: Miami, NCIS, Misplaced and The Twenty.
ME initially wanted to become a geneticist before graduating from Duke U with a major in theatre and Russian, reported Variety.
She performed the position of Kell Perim in Star Trek: Rebel. There was no immediate formal cause of death. In accordance with, U.S. publication Selection, the dying of Stephanie Niznik was "surprising".
In 2017, Stephanie was seen with the cast of television series, Everwood.
She played Maggie Bryce in The Sentinel (1996), Rose in Dr Quinn, Medicine Woman (1997), Debra Carbol in Sliders (1997), Lt. "Hobo" Green in JAG (1997), Dr. Roget in the 1998 TV film Mr. Murder, and Kelly Short in the TV film Emma's Wish (1998).
Friends from her time at Duke have paid heartbreaking tributes to the star, describing her as "so kind".
She was an active volunteer in hunger, children, and animal rescue organization.
Stephanie Niznik was 52 years old when she died.
She is survived by her mother, stepfather, brother, extended family and her two dogs, Nucleus and Jake, Variety reported.