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A Louisiana State Police vehicle is pictured in this Advocate file photo.

A man was killed in a single-vehicle crash on Interstate 10 in Ascension Parish early Sunday morning, Louisiana State Police say. 

Brandon Chapman, 34, of Donaldsonville, was driving west around 2:30 a.m. when his 2018 Honda Accord left the road for an unknown reason and struck a tree, investigators said.

Chapman was not wearing a seatbelt, police said. Officials pronounced him dead at the scene. 

The investigation is ongoing. A toxicology sample was taken from Chapman for analysis.