JOHNSON COUNTY, Tenn. -

A man is dead after a tractor trailer crashes in Johnson County.

According to Tennessee Highway Patrol the crash happened around 3:30 Saturday on State Highways 67 and 167 in the Butler Community of Johnson County.

An investigation is underway but police believe the driver of the tractor trailer may have suffered some type of medical condition before crashing.

The driver's name has not been released.