A Fayetteville man was struck and killed by a tractor-trailer on an Alabama highway Tuesday, officials said.

Marius M. Hillius, 28, was hit by a 1994 Peterbilt truck on I-59 in Etowah County while walking on the interstate,  Alabama Law Enforcement Agency spokesman Trooper Curtis Summerville said.

The crash occurred about 3:15 a.m., and the driver of the tractor-trailer was not injured.

Summerville did not say whether any charges would be filed.

The incident is under investigation.

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The man was taken to the hospital in critical??condition, but he??is now in serious condition. Two other people who were in the car were detained for questioning, Conroy said.