From the linked story:

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Witnesses said the truck was being driven erratically before it struck the bicycle, and was weaving back and forth between lanes, off into the grass in the median, then off onto the shoulder. According to a police report, the truck hit the cyclist and knocked the rider onto the hood and windshield of the truck. The rider was carried some distance before he came off the truck and onto the pavement.

Despite a broken windshield, the truck crossed the parkway and into the eastbound lane while continuing west and out of town. Witnesses followed and notified authorities of the hit-and-run vehicle's location.

Near the Long Hollow Road intersection with West Lamar Alexander Parkway, Carroll's truck, still traveling west in the eastbound lanes, collided with another truck. A 2000 Chevrolet 1500 pickup driven by William D. Pritchett, West Vinegar Valley Road, Friendsville, was damaged on the left front, side and rear.

Carroll's truck kept going after the sideswipe with Pritchett's truck and witnesses continued to follow.

The flight from the scene of the collision with the bicycle continued until Carroll's truck collided head-on with a 2003 Ford F-550 utility truck driven by Wilburn Arp, Janeway Road, Maryville.

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So essentially this driver strikes the cyclist, drives with him on the hood for a distance, crosses a median, side-swipes another car, ends up in a citizen based pursuit (witnesses were trying to catch him), and only comes to a stop when another motorist intentially hits him head on.

The police didn't file charges for three days, and they let the offending motorist leave the hospital after he refused treatment. <--- THAT makes me sick.

I'm very familiar with this stretch of road. Our tandem shop is located on this hwy near Maryville. I didn't hear about the memorial ride until after the fact. I wish my wife and I could have attended.