As of 11:10 a.m. 

Williamson County Sheriff's Office is investigating a fatal wreck that happened Wednesday morning that has shut down part of I-840 westbound at I-65. 

Tennessee Highway Patrol reported around 9:20 a.m. that a tractor trailer is overturned on the roadway near mile marker 30 near Thompson's Station. 

The road is down to one lane of traffic, and WSCO recommends seeking an alternate route. 

This story is developing.