A filing Tuesday in U.S. District Court charges the officer, Michael Hunter, 33, of Slidell, with one count of conspiracy to obstruct justice and one count of misprision of a felony.

The charges are part of a deal under which Hunter has agreed to help in the investigation of a cover-up after police shot six people — killing two — at the Danziger Bridge in September 2005, according to the person familiar with the case, who was not authorized to discuss it and spoke on condition of anonymity.

Hunter is scheduled to make his initial court appearance on April 7. He faces a possible maximum sentence of eight years in prison and a $500,000 fine. Townsend Myers, a lawyer for Hunter, wouldn't immediately comment.

Hunter remains on the force, but he is assigned to desk duty. Police spokesman Bob Young said Tuesday that Hunter was expected to resign before pleading guilty.

Michael Lohman, a retired lieutenant, and Jeffrey Lehrmann, a former detective, earlier pleaded guilty to participating in the cover-up.