GREAT MILLS, Md. (AP) — The student who fatally shot a female classmate last week at a Maryland high school died from a self-inflicted gunshot wound during a confrontation with a school resource officer who also fired his gun, authorities said Monday.

The St. Mary's County Sheriff's Office said in a statement that 17-year-old Austin Rollins fired a fatal shot to his head just as he encountered sheriff's deputy Blaine Gaskill. The shot fired by Gaskill struck the gun in Rollins' hand, the sheriff's office added.

The shooting occurred last Tuesday at Great Mills High School, about 65 miles (105...