Colt Gray pleads guilty to killing two students and two teachers in 2024 attack, which upped scrutiny of parental role.

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A teenage suspect has pleaded guilty to 55 charges, including murder, for a 2024 school shooting in the US state of Georgia.

The plea from Colt Gray, 16, came months after his father, Colin Gray, was convicted on charges of second-degree murder and involuntary manslaughter.