UPDATED:

One person is dead and another is in the hospital after a tractor trailer crash late Friday night in Montgomery County.

It all happened near mile marker 121 in the northbound lane of Interstate 81.

That's where a car crossed the median.

A tractor trailer going the opposite direction crossed into the median to avoid hitting that car.

This caused a chain reaction crash.

The person in the first car died.   

The tractor trailer driver was taken to the hospital.

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An accident is causing delays on Interstate 81 in Christiansburg Friday night.

The Virginia Department of Transportation says the wreck happened in the southbound lanes around 11:00.

The north right lane and right shoulder are closed.

The south left shoulder, left lane, and center lane are also closed.