Derek Carlile appealed his firing and last month was awarded his job back in binding arbitration.
The Daily Herald reports city officials have not said what Carlile's position will be. The 32-year-old previously worked in patrol.
In March 2012, Carlile left a .38-caliber revolver in a parked van with his children. His 3-year-old son found it and fatally shot his 7-year-old sister.
A jury was unable to reach a verdict on a manslaughter charge against Carlile. He was fired in the spring of 2013, but the Marysville Police Officers Association won a grievance case to have him reinstated.