A teenage girl who was shot by an ex-boyfriend earlier this week inside their Maryland high school has died after being removed from life support.

NBC News reports that Jaelyn Willey died late Thursday after her mother said the 16-year-old was brain dead and that there was "no life left in her."

"My daughter was hurt by a boy who shot her in the head ... and took everything from our lives, " Melissa Willey said at a news conference. "She will not make it."

Willey was one of nine, the second oldest child, and was a member of her school's swim team.

The teen was shot Tuesday at Great Mills High School in St. Mary’s County, Md., by Austin Rollins, 17.

Rollins died after trading gunfire with a school resource officer responding to the scene. It’s not yet clear whether Rollins was killed by the officer’s bullet or took his own life.

The St. Mary’s County Sheriff’s Office says Rollins and the girl had been in a relationship that recently ended.

A 14-year-old boy who was shot in the thigh during the encounter has been released from a hospital.

Investigators say the Glock handgun used in the shooting was legally owned by Rollins' father. In Maryland it is illegal for anyone under age 21 to possess a handgun unless it is required for employment.