Aihara was a passenger on a 2005 Harley-Davidson operated by a man, whose identity has not been determined.

Aihara and the man both died at The Queen's Medical Center after the 10:35 p.m. accident at the intersection of Kahala Avenue and Royal Place, 323 feet east of 'Elepaio Place.

The sixth two-person fatal accident of the year raised O'ahu's 2007 traffic death count to 50, compared with 74 on the same date in 2006. Eight motorcycle accidents, all of them since March 12, have accounted for nine of the 50 deaths.

The west-bound motorcycle was traveling at a "high rate of speed" on Kahala Avenue last night when the operator failed to negotiate a slight bend in the road near Royal Place, according to police vehicular homicide investigator Sgt. Michael Brede.

Brede added the two riders, neither of whom were wearing helmets, were thrown from the motorcycle when it fell and continued sliding on the ground into a unoccupied Ford multipurpose van parked in front of 4374 Kahala Ave.