SHERBURN, Minn. — A Marine from the southern Minnesota town of Sherburn was killed by a roadside bomb in Iraq, a spokesman for the family said Wednesday.

Lance Cpl. Robert Posivio III died Tuesday while conducting combat operations against enemy forces in the Anbar province, said Tom Hawkins, Posivio’s godfather.

Hawkins said Posivio was a passenger in a high mobility multipurpose vehicle that was hit by an improvised explosive device.

Posivio, 22, the son of Robert Posivio Jr. and Patti Posivio of rural Sherburn, had been recently sent back into combat after being injured in a mortar attack on April 13. His unit came under fire in Al Anbar Province near Fallujah and suffered two deaths in the earlier attack.

About three weeks after that attack, Posivio’s mother told the Sentinel of Fairmont that her son had suffered a severe concussion and shrapnel wounds. She said one of...