Lewis had ridden to the store with two other men June 8, according to the documents. When one of the men became involved in a fist fight with Mhoon inside the store, Lewis allegedly came in and shot Mhoon, police said in the documents.
Witnesses told police that Lewis continued to shoot as Mhoon fled the store, firing between five and seven shots, the documents said. Two witnesses later contacted police and identified Lewis, the documents said. Mhoon died at the scene.
A sentencing hearing for Lewis has been set for Feb. 22. Under state law, the minimum sentence for voluntary manslaughter with a deadly weapon, a class A felony, is 20 years in prison.