The tourist killed in a crash near Makapuu on Sunday has been identified as 36-year-old Vishnu Kanumalla of Massachusetts.
Police say Kanumalla was riding a rental moped on Kalanianaole Highway when he crossed the center line and collided into an oncoming motorcycle.
The motorcyclist was taken to the hospital in critical condition.
His passenger, a 40-year-old woman, was also hospitalized with serious injuries.
Investigators believe speed is a factor in the crash.