According to arrest warrants, alcohol and speed caused Felix Antonio Juarez-Antunez, 34, to crash near the intersection of M. Durwood Stephenson Highway and Wilsons Mills Road on Sunday night.
Juarez-Antunez did not have a driver's license. Police estimated he was speeding 90 mph in a 45 mph zone at the time of the deadly crash.
The newly-crowned Miss Garner Outstanding Teen -- Hailey Wagner -- was one of the teens who was injured, as was her 14-year-old brother.
Another 15-year-old, Ethan Michael Handley, has died from his injuries.
Hailey Wagner and her brother both have severe neck and spinal injuries. They are stable.
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The driver of the other car, Marjory Howell Wagner of Selma, was killed. She was Hailey's grandmother.
Smithfield Police confirmed that Juarez-Antunez, a Smithfield resident, is under an Immigration and Customs Enforcement detainer.
A third vehicle, which was sitting at a stoplight, was damaged by debris from the other vehicles.
The North Carolina State Highway Patrol is investigating.
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Juarez-Antunez was booked on a $350,000 bond.