EVERETT, Wash. -- The Marysville Police Department has fired Officer Derek Carlile whose gun was used by his 3-year-old son to fatally shoot his 7-year-old sister.

A spokesman for the city said Monday Carlile was fired as a result of an internal investigation, but it would say nothing else about the personnel matter.

The Daily Herald reports Snohomish County prosecutors dropped a manslaughter charge against the officer last year after a jury was unable to reach a verdict.

Carlile left a .38-caliber revolver in the family van with his four children in March of 2012 while it was briefly parked in Stanwood. His 3-year-old son grabbed the gun and fired a shot that killed 7-year-old Jenna.

His lawyer called it a tragic mistake.

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