One person is dead following a single car rollover on the 417 westbound at highway 138 in Casselman.

Ontario Provincial Police say the fatal crash happened around 2:40 Sunday morning. The driver and lone occupant was ejected from his vehicle. Paramedics transported the man to hospital where he was pronounced dead.

The crash closed the westbound lanes of highway 417 until roughly 11 a.m. Sunday. 

There is no word on what caused the crash. The incident is under investigation.