A 45-year-old Captain Cook man died Monday after the motorcycle he was driving rear-ended a truck on a Hawaii County Highway in South Kona.

Hawaii County police believe that speed and alcohol were factors in the crash that occurred at 7:35 p.m. Monday on Route 11 south of the 109-mile marker in Captain Cook. A negligent homicide investigation was initiated and police ordered an autopsy to determine the cause of death. 

The name of the motorcyclist, who was not wearing a helmet, is being withheld pending identification and notification of the next of kin. 

Kona patrol officers said the motorcyclist was driving a 2010 Harley Davidson motorcycle and traveling south on Route 11 when he rear-ended a 2005 Toyota pickup truck stopped in traffic to make a left turn onto Seiganji Mission Road. 

The driver of the pickup truck, a 35-year-old woman from Captain Cook, and her four-year-old son were not injured. 

Fire Department rescue personnel took the motorcyclist to Kona Community Hospital, where he died at 7:56 p.m. 

Police ask that anyone with information about this crash call Officer Larry Flowers at (808) 326-4646, extension 229. 

This is the 7th traffic fatality this year compared with none at this time last year for Hawaii island.