Army investigators have opened a criminal investigation into a one-vehicle accident on post early Saturday that killed a Schofield Barracks soldier and injured three others, officials said.

The dead soldier, Spc. Phillip S. Bullins, 23, of Carthage, N.C., was a passenger in the vehicle that crashed on Kolekole Pass, the Army said. Three injured soldiers — two men and a woman, all 19 — went to the Queen’s Medical Center in serious condition, an Emergency Medical Services supervisor previously said.

Paramedics responded to a crash on base at 12:41 a.m. Saturday. At least two people were ejected from the vehicle, which had rolled over into an embankment, an EMS official said.

Bullins joined the Army in 2009 and served as an infantryman and Stryker armored vehicle driver during the 2nd Brigade Combat Team’s deployment to Iraq from June 2010 to June of this year.

The U.S. Army Criminal Investigation Command is looking into the accident to see whether the unidentified driver should face criminal charges, officials said.

The 25th Infantry Division referred calls to an East Coast-based Criminal Investigation Command spokesman, who could not be reached for comment Monday.

For the past several years, as large numbers of Schofield soldiers have returned from combat and adrenaline-filled missions overseas, Army officials have stressed the need for soldiers to be mindful of safety, moderation and responsibility back in Hawaii.

"Especially when they got back from a deployment, we hammered into these soldiers constantly that safety should be utmost in their minds," said Maj. David Bolender, a 25th Division spokesman.

On the dating forum "Plenty of Fish," Bullins said he liked to do "a lot of things with sports" and hang out on the beach. He said he wanted to finish his time in the Army and go back to school and become a physical education teacher.

Fry and Prickett Funeral Home in Bullins’ hometown said on its website that it would announce funeral arrangements for the soldier.