Niznik died unexpectedly on June 23 at her home in Encino, California, Variety reports. Her cause of death is unknown. Niznik played sweet neighbor Nina Feeney on all four seasons of The WB drama. Niznik reunited with the Everwood cast for a 15th-anniversary panel at the Television Critics Association press tour in 2017. Niznik also had roles on Lost, Diagnosis Murder and Grey's Anatomy.