Police arrested one motorist and were looking for another following crashes in different parts of the island that left two men dead within about an hour late Sunday.

On the North Shore a 21-year-old Aiea man was killed when the car he was riding in crashed along Kamehameha Highway in Pupukea at about 10:23 p.m. The city Medical Examiner’s Office identified him as Unique Murry.

Later, in town, a 22-year-old Honolulu man was struck while crossing South King Street at about 11:05 p.m. by a dark-colored vehicle that left the scene. He was pronounced dead at the scene at 11:24 p.m.

The medical examiner’s staff is withholding his identity pending notification of his family.

A Kahala woman, 23, was arrested on suspicion of negligent homicide in connection with the Pupukea crash. She was released pending investigation.

The driver and three others were taken to the Queen’s Medical Center in serious condition. The others were a 23-year-old woman, an 18-year-old man and a 19-year-old man.

The 19-year-old was admitted in serious condition, while the driver and the two other passengers were treated and released.

Police said the vehicle was heading toward Haleiwa when it crossed the center line just south of Kupaoa Place and hit a rock wall, an unoccupied parked car and two fences before it went airborne and flipped, slamming into the carport of a Kame-hameha Highway home.

A male passenger, believed to be Murry, was ejected from the vehicle. He was taken by city paramedics to Wahiawa General Hospital, where he was pronounced dead, police said.

Speed and alcohol are believed to be factors in the crash, although the incident is still under investigation.

The crash closed Kamehameha Highway in both directions from Kapuhi Street to Pupukea Road for several hours. Hawaiian Electric crews were called to repair a power line damaged by the crash.

Meanwhile, police are seeking the public’s help in locating the hit-and-run driver involved in the Honolulu crash.

Police said the man was crossing South King Street near Victoria Street and the Blaisdell Center Concert Hall when he was hit by a dark-colored sedan traveling east.

Police said the man killed in a hit-and-run crash at South King and Victoria streets Sunday sustained massive head and bodily injuries.

It is unclear whether the pedestrian was in a crosswalk, but excessive speed may have been a factor, police said.

South King Street was shut down for a time from Ward Avenue to Pensacola Street as police investigated the scene.

The car should have extensive front-end damage and may have a cracked windshield, police said. Anyone with information is asked to call police at 955-8300.

The deaths were the 53rd and 54th traffic fatalities on Oahu’s roads this year. Eighteen of the victims, one-third, were pedestrians.

There were 55 fatalities recorded in all of 2009, 10 of them pedestrians, compared with 46 total traffic deaths in 2008, 14 of whom were pedestrians.

Police and community advocates, in the wake of a recent spate of pedestrian fatalities, urged both motorists and pedestrians last week to use more care on Oahu roads during the holiday season. Six of the last 10 deaths were pedestrians.

Star-Advertiser reporter Dan Nakaso contributed to this report.

 CORRECTION: Police said the man killed in a hit-and-run crash at South King and Victoria streets Sunday sustained massive head and bodily injuries. A previous article attributed the description to city Department of Emergency Services spokesman Bryan Cheplic.�