Authorities say the victim in his mid 20's may have been a member of the United States Air Force.
The accident happened in broad daylight at a busy intersection where it just so happened a group of friends and families were celebrating the Grand Opening of the Chuck James music studio newly located at the intersection of Kamehameha highway and California Avenue.
Jeffrey James says everyone was enjoying his father's new establishment when they heard and saw the crash. " It was a just a big big boom, pow, we all looked, we thought cargo was just disaster everywhere," he said.
Police say a motorcyclist was traveling towards Honolulu when a van turning left onto California avenue made a left turn in front of him.
James says he rushed over with others from the party to see if they could help the injured motorcyclist.
"People were being very cautious, saying touch him, don't touch him, people with mixed emotions just you know 'what do we do?'," he explained. James says the rider was unconscious the whole time and looked to be in bad shape. "He was out, you could see his muscles and his bones we're kind of a little bit disjointed," he continued.
Investigators say the motorcyclist was in extreme critical condition and taken to Wahiawa General where he expired.
The intersection at California avenue and Kamehameha highway was closed in all directions. Vehicles were rerouted through detours, causing heavy traffic in Wahiawa for several hours.
The driver of the van was not injured in the crash.
Police say they are still looking into whether the motorcyclist was wearing a helmet.
Speed, alcohol and drugs do not appear to be factors in the deadly accident.