The teenager was identified today by the Honolulu Medical Examiner's office as Marilene Bacani, 16. She died yesterday at 8:02 a.m. at The Queen's Medical Center after being taken off life support.

Bacani suffered massive head injuries when she was hit on Fort Weaver Road by a station wagon being driven by a 67-year-old woman. Police say she was in a crosswalk or very near one at the time of the accident.

Traffic investigator Sgt. William Baldwin said the negligent homicide case could take three months to complete. There were no obvious reasons for the accident, he said. The driver was not driving faster than the 45 mph speed limit and neither drugs nor alcohol was a factor, he said.

"It's probably just inattention on both parties," he said. "Why did the person cross the road? Did she not see the car? The car was not speeding. Why didn't they see each other?"

Bacani, an only child who had turned 16 a week before the accident, had just completed her sophomore year at James Campbell High School. Esther Villanueva, school secretary, said the girl was on her way Tuesday morning to do volunteer work on a school project.

Bacani's aunt, Prima Roncal Brotton, said in a telephone call from Gresham, Ore., that the girl was an honor roll student.