WEST VALLEY CITY — A West Valley police officer has been cleared in the shooting of a man who was holding a knife to his ex-wife and threatening to kill her Aug. 30.

The Salt Lake County District Attorney's Office issued a letter to the West Valley Police Department on Tuesday stating an investigation into the fatal shooting of 40-year-old Richard Jackson by officer Tyler Longman was lawful.

Jackson broke into the house of his ex-wife, Revangelet Jackson, and forced her from the home when officers arrived on scene. Jackson was holding his ex-wife on top of him and held a knife to her throat. He repeatedly threatened to kill her. Officers tried to reason with Jackson, but he began counting down from 10.

Revangelet arched away from the knife, exposing Jackson's head, and Longman fired two rounds, one of which struck Jackson.