Richard Aspinwall, the defensive coordinator for Apalachee High School’s football team, was among four people killed in a mass shooting at the school on Wednesday.

The Georgia Bureau of Investigation identified Aspinwall, 39, as one of those killed. The school’s website lists him as the football team’s defensive coordinator and a math teacher.

Before working at Apalachee, Aspinwall was a teacher and coach at Mountain View High School in Lawrenceville, Georgia.

“Our thoughts and prayers are with the family of former Mountain View High School teacher and coach Ricky Aspinwall, who lost his life today at Apalachee High School,” the Mountain View High School athletic department said in a statement on its Facebook page. “Mountain View extends its deepest condolences to the entire Apalachee High School community.”

Messages left with Aspinwall’s family and the Barrow County School District were not immediately returned.

Aspinwall, 53-year-old math teacher Christina Irimie and 14-year-old students Mason Schermerhorn and Christian Angulo were killed when a gunman opened fire inside the school Wednesday morning, according to the GBI. The GBI said Colt Gray, 14, turned himself in when he was attacked by police officers, was arrested and faces murder charges.

On Wednesday evening, the GBI said it was still conducting an active investigation, gathering evidence and working to understand the timeline of events.

Nine other people – eight students and a teacher – were injured in the shooting and taken to hospitals.