Admitting a cover-up of shocking breadth, a former New Orleans police supervisor pleaded guilty to a federal obstruction charge on Wednesday, confessing that he participated in a conspiracy to justify the shooting of six unarmed people after Hurricane Katrina that was hatched not long after police stopped firing their weapons, the FBI announced.

The guilty plea of Lt. Michael Lohman, who retired from the department earlier this month, contains explosive details of the alleged cover-up and ramps up the legal pressure on police officers involved in the shooting and subsequent investigation. It's unclear when Lohman's cooperation with federal authorities began, but he presumably is prepared to testify against the officers he says helped him lie about the circumstances of a shooting he immediately deemed a "bad shoot."

Lohman, who pleaded guilty in federal court to conspiracy to obstruct justice, admits he failed to order the collection of evidence or canvassing of witnesses, helped craft police reports riddled with false information, participated in a plan to plant a gun under the bridge and lied to investigators who questioned police actions.

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