A father who gave his son the rifle used in a school shooting that killed four people has been sentenced to 15 years in prison. Colin Gray was sentenced two days after his 16-year-old son, Colt Gray, received a life sentence for the 2024 mass shooting. The case marks the first time a parent in the state of Georgia has been convicted of second-degree murder over a mass shooting carried out by their child. Prosecutors say the case is part of a broader push to hold parents accountable in an effort to curb gun violence in US schools.