A 19-year-old man was arrested Wednesday in connection with a traffic accident where the the Jeep he was driving hit a freeway guardrail and rolled over several times, killing an 18-year-old girl.

The suspect was arrested at 3 p.m. Wednesday at Tripler Army Medical Center on suspicion of first-degree negligent homicide and two counts of second-degree negligent injury, one count of first-degree negligent injury and driving under the influence while under the age of 21.

Kortney Biton-Schubert, 18, was killed when she and four other people were thrown from their vehicle after the driver lost control of the car, struck a guardrail and rolled over several times on the H-1 freeway near the Vineyard Boulevard offramp Aug. 12. The driver and his four passengers were ejected from the vehicle. The accident occurred a mile east of the Vineyard Boulevard offramp.

The medical examiner said Biton-Schubert died of cranial cerebral injuries.

Alcohol and speed were believed to have been a factor in the accident that occurred at 9:40 p.m. police said.

Emergency Medical Services said three males — two 20-year-olds and one 19-year-old — and a woman, 19 — were taken to the hospital in critical condition.

This was Oahu’s 31st traffic death, compared to 30 at the same time a year ago.