The shooting occurred at about 2 p.m. behind Roy Clark Field House at Lincoln County High School in Fayetteville, about 70 miles south of Nashville near the Alabama border.
"You'd never believe it would happen, but it did," said Robert Alder, supervisor of facilities for the county school system. "It's very sad."
He said the shooter was in custody and nobody else was hurt.
WAAY-TV in Huntsville, Ala., quoting police and school sources, identified the gunman as Jacob Davis. Davis and the victim, Robert Creson, 18, had been arguing about a girl, WAAY reported.
Creson was shot multiple times and died about 15 minutes after being brought to Lincoln Regional Hospital, spokesman John Fitzsimmons said.
It was at least the fourth fatal shooting at a Southern school since Oct. 1, when prosecutors say a 16-year-old student in Pearl, Miss., killed his mother, then went to school and shot nine students. Two of them died.
Two months later, a 14-year-old student opened fire on a student prayer circle at a high school in West Paducah, Ky. Three students were killed and five wounded.
Six weeks ago, an 11-year-old boy and his 13-year-old friend opened fire on classmates in Jonesboro, Ark. Four pupils and a teacher were killed and 10 people wounded.
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