Driver killed after big-rig overturns on southbound Interstate 5 in Yolo County

A big-rig overturned on southbound Interstate 5 in Yolo County near Woodland early Thursday morning, killing the driver, officials said. 

According to the California Highway Patrol, the incident took place on the freeway south of Zamora, shortly after 6:05 a.m. The collision blocked both southbound lanes of I-5 through the area.

Photojournalist Dave Grashoff reported that the driver of the big-rig was extricated and a helicopter was called to the scene. The California Highway Patrol later confirmed that the driver had died.

Authorities did not say what led up to the crash.

"It's unknown at this time, may have been a distraction or fell asleep... unfortunately, the solo occupant did not survive the crash," said Sgt. David Barker of the California Highway Patrol.

The driver's identity has not been released.

As of about 7:30 a.m., one southbound lane of Interstate 5 was open through the area.