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UPDATED with the driver's name and more details.

FRANKLIN COUNTY • A man who authorities say had threatened "suicide by cop" and fled from officers died Sunday after crashing into a tractor-trailer near St. Clair.

The driver was identified as Thomas W. Washburn, 36, of the St. Louis area. He was pronounced dead at the scene. The Missouri Highway Patrol says it appears he rammed into the big rig intentionally.

About 5:15 p.m., the Missouri Highway Patrol was warned by St. Louis County officers about a man who had said he wanted to be killed by police, according to trooper Dallas Thompson. The advisory included a description of a vehicle, which was spotted westbound on Interstate 44.

Eureka police tried to stop the vehicle, but it fled west. They called off their pursuit near Pacific, Thompson said.

The speeding driver hit a semi-tractor trailer from the rear at mile marker 241, near St. Clair, the Missouri Highway Patrol said. That's about 17 miles southwest of Pacific.

According to a Missouri Highway Patrol crash report:

Washburn was traveling westbound on I-44 in the left lane, "actively fleeing from law enforcement officers." A 2015 Volvo semi-truck was also headed westbound on I-44 ahead of Washburn's 2007 Pontiac G6. Washburn accelerated, merged into the right lane, and crashed into the back of the semi-truck. Washburn's vehicle then skidded to a stop in the middle of the road.