WILTON - One person is dead following a head-on crash with a dump truck in Wilton last night.

Police say the car, driven by 71-year-old Frank Johnson, of Norwalk, crossed the center line on Route 7 and hit the truck at around 9:30 p.m.

Investigators say Johnson had spent nearly 40 years working as a bus driver for the Norwalk School District. They say they don't know what caused Johnson to cross the center line and are hoping to learn more about what led up to the deadly crash.

The driver of the dump truck was not injured.

VIDEO: Fatal Wilton crash