A man whose teenage son shot dead four people at a US high school was sentenced to 15 years in prison on Thursday in a rare case of a parent convicted over a shooting carried out by their child. Colin Gray, 55, gave his son Colt the AR-15-style rifle used in the shooting as a Christmas present in 2023 despite warnings that the boy had threatened to carry out a school shooting. Colt Gray, who is now 16, pleaded guilty to the September 2024 attack at Apalachee High School in the Georgia town of Winder and was sentenced on Tuesday to life in prison without the possibility of parole. Jennifer and James Crumbley were the first parents of a school shooter convicted of involuntary manslaughter in the United States for the actions of their child. Colin Gray is believed to be the first parent to be charged and convicted of murder over a shooting carried out by their child.