Updated

Authorities say they've closed their investigation into the death of a bible college student who drowned in a Tennessee creek after a car crash.

Blount County Sheriff's spokeswoman Marian O'Briant told The Knoxville News Sentinel that 20-year-old Blake Smith of Trussville, Alabama, likely suffered a head injury Feb. 6 when the car he was trying to free from mud at a construction site crashed. She says that injury probably caused him to become "confused and disoriented," leading to his drowning in the shallow creek.

Family members previously said they suspected foul play, noting the car was found nearly a mile (1.6 kilometers) from the creek. His mother, Kim Smith, told the newspaper relatives found the death "confusing."

Smith studied at The Crown College of the Bible outside Knoxville.

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Information from: Knoxville News Sentinel, http://www.knoxnews.com