Muskogee police are asking for help to find a witness to this week's officer involved shooting.
Officers want to talk with the man who flagged them down on Monday to tell them about a man with a weapon.
8/8/2017 Related Story: Muskogee Police Release Names In Officer-Involved Shooting
Investigators say Officer James Moore Jr. shot Sean Ellis in the stomach after Ellis pointed a knife toward police.
Ellis survived the shooting.