The Baton Rouge police officer who drove his patrol car into an LSU lake early Sept. 11 resigned effective Tuesday, a police spokesman said.

Byron Boudreaux, a two-year veteran of uniform patrol in the First District, was placed on administrative leave after the accident while the department investigated how his marked patrol unit ended up in the lake.

Authorities found the car in the water near the intersection of East Lakeshore Drive and Cedardale Avenue at about 2 a.m. Sept. 11.

Cpl. L’Jean McKneely said because Boudreaux resigned, the investigation is over.

Police have released few details about how Boudreaux’s unit ended up in the lake. McKneely said Tuesday that Boudreaux did not break any criminal laws and was not legally under the influence when given a blood-alcohol test at the scene.