Investigators say 30-year-old Axel Barreto was arrested at a suburban motel Wednesday night, around the time one of his alleged victims was taken off life support.
Authorities say Barreto fired a dozen or more shots into a car loaded with seven teenagers late Tuesday after the boys arrived for a confrontation with his stepsons. Police say the planned fight stemmed from a dispute at school that then spilled on to Facebook.
Police identified the victims as Joshua Soto and Dante Lugo, both 14, and 16-year-old Javier Orlandi. Soto and Orlandi died late Tuesday.
Another 16-year-old who was behind the wheel was wounded in the neck.