A dog walker was killed after a tire flew off a truck and smashed into her.

Kimberly Touchton, 22, was likely to have been caught off guard by the killer truck, according to police.

And truck driver Brian Seth Carmichael is expected to face charges over the death.

The 25-year-old was driving his 2003 Dodge Ram pickup late on Sunday when one of its tires somehow got loose and shot 400 yards from an overhead bridge into a trailer park below, Houston County Sheriff’s Lt. Kent Bankston told The New York Post .

The tire struck Miss Touchton who was walking her dog.

Lt Bankston said: "It severed her spine.

"It broke her neck and although they did attempt life-saving measures out there on the scene, she was dead when they got to the hospital. I don’t think she even knew what hit her."

Kimberly Touchton died after being hit in the head by a tire

Miss Touchton was later pronounced dead at a hospital after being found in the trailer park by her fiancé, Bankston said.

Officers took Carmichael into custody following the accident after finding his truck a quarter-mile from the scene, parked on the side of a road with one of its tires missing.

"So we started putting the pieces of the puzzle together and tracked him down using the truck’s tag,” Bankston said.

Investigators also received an anonymous tip from someone who said Carmichael told them he thought he "had hit something" while driving, Bankston said.

Miss Touchton was later pronounced dead at a hospital

Carmichael has been charged with failing to report an accident with injury or death.

Deputies believe Carmichael "knew what happened" after the tire flew off his truck, and Bankston said the case was incredibly unusual.

"Absolutely," Bankston said when asked if the incident was a freak occurrence.

Kimberly Touchton's spine was severed by the tyre

"I’ve been doing this for 33, 34 years and this is probably one of the most, if not the most freak accident I’ve ever seen."

Touchton, of Fort Valley, was a student at Central Georgia Technical College who worked at a nursing home, according to her Facebook profile.

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One of her cousins said she had a heart of “gold” and loved just about everyone she met.

"She was just too young too kind and too full of life!!!” Candy Nicole Touchton Marberry wrote.

"[I’ll] never get over this it’s the worse [heartbreak] I’ll ever experience when life is just ripped from the people u love the most."