Reports have emerged revealing that a 14-year-old boy sent a final text message to his mother just before he was killed in a mass shooting at Apalachee High School in Winder, Georgia. His sister has also spoken out about the heartbreaking loss.

Mason Schermerhorn, one of the four victims of the shooting, reached out to his mom from a restroom during the chaos. Ronald Clark, a youth minister and chaplain who was assisting during the aftermath, shared how he tried to help Mason’s mother locate him in the midst of the crisis. Clark, who had received the tragic news while at a store, rushed to the school and offered his help to the police.