RAPID CITY, S.D. (AP) — A federal grand jury has indicted a former Oglala Sioux Tribe police officer accused of improperly using a stun gun.

U.S. Attorney Brendan Johnson says 32-year-old Rebecca M. Sotherland was indicted Tuesday on charges of deprivation of rights under color of law and assault with a dangerous weapon.

Authorities say Sotherland used a Taser several times on a man lying on the ground. A passer-by shot video and posted it online, drawing attention to the incident.

Sotherland was fired Thursday for the Aug. 15 incident in Manderson.

It's unclear whether Sotherland has legal representation. She couldn't be reached Tuesday. Conviction carries a maximum penalty of 10 years in prison and a $250,000 fine.

The man shot with the stun gun wasn't seriously hurt. Thirty-two-year-old Jeffrey Eagle Bull posted bond last week on three charges.