MARINETTE, Wis. (AP) — A Michigan man was charged Wednesday with the fatal shooting of three teens who were among a group ambushed while hanging out at a river on the Wisconsin border.

Scott J. Johnson, 38, of Kingsford, Mich., was charged with three counts of first-degree intentional homicide. Authorities say he went to the Menominee River on July 31 and opened fire on a group of swimmers, killing three and injuring one.

He faces life in prison without parole if convicted. Wisconsin does not have the death penalty.