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Smith was "involved in a vehicle accident" at the construction site and suffered from brain bleeding, which likely caused him to become "confused and disoriented," the Blount County Sheriff's Office said in a Facebook post Tuesday.
Smith then drowned in water that was "approximately 18 to 20 inches deep," according to Blount County Sheriff's Office spokeswoman Marian O'Briant.
Investigators have no evidence to suggest anyone was with Smith, O'Briant said.
The medical examiner ruled his death an accidental drowning. The toxicology report was negative for drugs and alcohol, the sheriff's office said.
Smith's car crashed while he was trying to free it from mud at the construction site, O'Briant said.
Investigators believe he "used a piece of concrete to place on the accelerator, while he pushed the vehicle from the driver's side fender near the driver's door," O'Briant said, adding that muddy handprints and footprints were found on and around the car, respectively.
Investigators believe Smith was outside the car when it began to move and crashed into the deck of the house. He "got caught between the driver's door and the decking support," and that's when he suffered the head injury, O'Briant said.
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Deputies found the car "still running with the reverse lights on," the report reads. The driver's side door was "completely forced forward to the front quarter panel." A "piece of concrete" was lying in the driver's side floorboard, O'Briant said.
Near the car, deputies found one boot, a hat, a pocket knife and Smith's wallet, which contained cash and credit cards. Smith's cell phone was found inside his car, and authorities "don't know why he didn't try to call someone," O'Briant said.
The car had "extensive damage" from the crash into the house, the report reads. Deputies initially said it appeared the car had been driven around the back of the house before it crashed into the deck of the home, destroying a set of stairs and several support beams.