MINNEAPOLIS — The family of a woman fatally shot by police following a car chase that ended in Eden Prairie last year is suing the officer who killed her. 

Dawn Pfister and Matthew Serbus were fatally shot on Highway 212 after they led police on a chase. Police said both refused officers’ commands to drop a knife.

Pfister’s family filed a federal lawsuit Monday against the Chaska officer who shot her, accusing him of improperly using deadly force. Relatives said the 34-year-old mother of two from Elkhorn, Wisconsin ,posed no threat to police and had been reported as a hostage. Reports said the lawsuit also names the city of Chaska.

In December, a Hennepin County grand jury declined to bring charged against the four officers involved in the deadly encounter in February 2014.