( CNN ) -- The fourth former New Orleans police officer pleaded guilty this week in connection with police shootings of civilians on a Louisiana bridge in the days following Hurricane Katrina , authorities said . Former officer Robert Barrios pleaded guilty in federal court to a charge he failed to report a cover-up in the investigation into the Danziger Bridge shooting in New Orleans , the Department of Justice said in a statement Wednesday . He faces a maximum sentence of five years in prison and a fine of $ 250,000 . Barrios ' plea comes after the guilty pleas from three other former New Orleans police officers -- Michael Lohman , Jeffrey Lehrmann and Michael Hunter -- involved in the Danziger Bridge case , the Justice Department said . Two civilians were killed and four others wounded in the shootings on September 4 , 2005 , six days after Katrina slammed into the Gulf Coast . In the first shooting , on the east side of the bridge , one person , later identified as James Brissette , 19 , was killed and four people were wounded , prosecutors said . In another shooting on the bridge 's west side , Ronald Madison , 40 , a severely disabled man , was killed . Madison 's brother was arrested but later released without being charged , authorities said . Barrios admitted in court that he met with officers after the shooting to get their stories straight , prosecutors said . He also admitted that he lied when he told investigators that he had seen civilians with handguns . `` In the days following Hurricane Katrina , the people of New Orleans were relying upon law enforcement to protect public safety . Instead , the officers involved in this incident and its cover-up abused their power and violated the public trust , '' said Thomas E. Perez , Assistant Attorney General in Charge of the Justice Department 's Civil Rights Division .
Former officer admits cover-up in investigation of New Orleans bridge shooting . Two civilians killed , four wounded in police shooting days after Hurricane Katrina . Three officers have since issued guilty pleas for their involvement .