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.
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.
Juarez-Antunez was booked on a $350,000 bond.