A 65-year-old Kihei man was killed Wednesday when the truck he was driving drifted off Mokulele Highway on Maui and hit a concrete bridge abutment.

Maui police said Dennis Witt was not wearing his seat belt when he died at 5:39 p.m. The cause of death is pending an autopsy.

The accident occurred on Mokulele Highway, 0.7 miles south of Mehameha Loop in Kihei.

Witt was driving a white 2004 Ford Ranger pickup truck, traveling north on Mokulele Highway when it drifted off the roadway onto the east shoulder and collided into a concrete bridge abutment.

Witt was pronounced dead at the scene. There were no passengers in the truck.

The involvement of speed, drugs and alcohol is under investigation.

This is Maui County’s ninth traffic fatality in 2016, as compared to 13 this time last year.