Though working for Judge Isaac C. Parker, Bill Colbert worked mostly in Atoka, in the Choctaw Nation.
He was primarily known to be quick to use his gun, and the Muskogee Phoenix did report two separate incidents where Colbert killed suspects who resisted being arrested by Colbert. Of African Choctaw ancestry,
Colbert worked mostly in the Choctaw nation where he had knowledge of the land, language and customs of the nation. His years of service were during the Parker years, though it is not certain when or where he later retired.