The man who died in a three-vehicle collision in Kapolei Monday afternoon has been identified as 65-year-old Keith Komatsubara of Pearl City, the Honolulu Medical Examiner said.

Komatsubara was a retired Honolulu fire fighter.

“Our thoughts and prayers go out to his family during this difficult time,” said Honolulu Fire spokesman Capt. David Jenkins.

Honolulu police said medication or a medical condition of a another driver may have been a factor in the collision.

The incident happened at about 3:20 p.m. Monday, when a vehicle traveling west driven by a 64-year-old Kahuku man veered left and crossed the center median and collided head-on with two vehicles traveling east on Farrington Highway, police said.

Both the Kahuku man and a 48-year-old Waianae woman in a third vehicle were in serious condition when taken to the Queen’s Medical Center.

Police said their conditions have improved.

Police closed part of Farrington Highway for close to four hours to investigate the crash near Honokai Hale.

Police shut down both town-bound lanes and one Waianae-bound lane on Farrington near Laaloa Street until 7:30 p.m.

“I saw on the far left two cars in the bushes,” said passerby Jason Laquihon.

“There was also a minivan in the middle of the road with the front end smashed.”

Laquihon, who was driving west, said one of the cars had the front driver-side roof smashed in.

He said three ambulances from the Campbell area responded to the accident.

Police reopened traffic flow at about 7:30 p.m.

The death was the seventh traffic fatality on Oahu this year, compared to six for the same period last year.