A 46-year-old man died early this morning in a single-vehicle crash in the Ewa Beach area.

The man was driving north on Fort Weaver Road around 1:22 a.m. when his vehicle veered off the road onto the center median and struck a tree, according to Honolulu police.

Emergency Medical Service personnel transported the driver to a hospital, where he was later pronounced dead.

Police said the man was not wearing a seatbelt at the time of the crash. Speed is considered a contributing factor to the crash, but it remains unclear if alcohol or drugs were involved.

This was the fourth traffic fatality on Oahu this year, down from seven reported at the same time last year.

The investigation into the crash is ongoing, police said.