The Kenosha, Wisconsin, police officer who shot last August is back on duty and will not face discipline, the police department announced Tuesday.

The officer, Rusten Sheskey, returned from administrative leave in late March. He was "found to have been acting within policy and will not be subjected to discipline," according to a statement Tuesday from Kenosha Police Chief Daniel Miskinis.

The determination was made after an outside investigation and an independent expert review, the statement said.

Sheskey was not charged. Kenosha County District Attorney Michael Graveley told reporters in January that Sheskey and other officers would have had a strong case for self-defense, NBC reports.

Blake filed a federal complaint against Sheskey, the only defendant, seeking unspecified damages last month.

State prosecutors have said a blade was found in the footwell of the vehicle. Raysean White, the bystander who recorded the video, said he heard police yelling "drop the knife!" but never saw Blake armed with a blade.