A road accident that claimed the life of a truck driver in New Zealand last year was caused by the driver vomiting, slipping on the vomit, then falling into the road, where one of the vehicle's wheels rolled over his head , a coroner reported Friday.

Garry Willem Voorkamp, 53, suffered fatal head injuries on Sept. 24, 2014, according to The New Zealand Herald. Voorkamp was working in the town of Lumsden and driving a five-ton Caterpillar road grader when colleagues saw the vehicle suddenly swerve into the middle of the road. When they went to investigate, they found Voorkamp with his head lodged between the machine's two rear wheels.

Voorkamp felt ill earlier in the day and was having trouble with his eyes, possibly because he'd slept with contact lens in his eye, a witness said at an inquest hearing in September. However, he declined his road crew's offer to go home, reports New Zealand publication Stuff .