She is best known for her role in The WB's Everwood (2002-2006) as Nina Feeney, the Brown family's neighbor and Dr. Andy Brown's (Treat Williams) love interest.
USA publication Variety reported that the death was "unexpected".
Niznik's passing was first announced on Friday, though a cause of death has not been reported. She also had a recurring role on "Life is Wild" and guested on "Lost", "NCIS" and "CSI: Miami".More news: Boeing 737 Max chief to retire amid executive shuffle
She then again returned to the "Star Trek" in the "Rogue Planet" episode of the series "Star Trek: Enterprise".
In 2017, Niznik was among the Everwood stars that reunited at the Television Critics Association in honor of the show's 15th anniversary. She played the role of Dot.
Series creator Greg Berlanti and executive producer Rina Mimoun were also at the reunion, though Chris Pratt and Sarah Drew did not make the event. Quinn Since 1994, she worked as an actor and made her film Exit to Eden when Diana made her debut.More news: Forty-something Tiger Woods burns bright in inspiring Serena Williams
Stephanie Niznik wanted to become a geneticist.
Originally in Bangor, Maine, Niznik meant to work as a geneticist before graduating in theater and Russian from the Duke University. She was born in Bangor, Maine and graduated from Duke University in Durham, North Carolina with her Master's degree in Fine Arts.
Stephanie Niznik is survived by her mother, brother and stepfather, and her dogs Nucleus and Jake.More news: Barbie doll launched to honour singer David Bowie's hit single
Stephanie beloved to spend her time volunteering. "I'm lucky to have known her. Rest In Peace Stephanie".
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