Anthony Piercy filed a lawsuit this week against the Missouri Department of Public Safety and the agency’s director. The Kansas City Star reports he’s asking for a reversal of the decision that revoked his license.

Piercy was sentenced in September for misdemeanor negligent operation of a vehicle after the drowning of 20-year-old Brandon Ellingson, of Clive, Iow. Clive died in 2014 at the Lake of the Ozarks.

Piercy lost his patrol job. But earlier this summer, a Cole County judge ruled that the patrol’s leader didn’t have the authority to fire Piercy.

Piercy cannot return to the patrol without his peace officer license.