Once it crashed, Crawford said the rotor blades "exploded" and "hundreds of little pieces were floating on the water."
Within 10 minutes of the 911 call, first responders were on the scene and in the river to search for the fourth person, who Corcoran said they believed was still in the helicopter submerged underwater.
Using underwater sonar and their rescue squads, the Knoxville Police Department and Fire Department spent close to three hours searching for the final victim in the river, according to the fire captain.
The three survivors, meanwhile, did not require medical attention, Corcoran said at a second press briefing.
On Monday night around 9:45 p.m., after nearly two hours of searching the waters, authorities finally recovered the body of the fourth person near the crash site, according to The Knoxville News Sentinel.
At this time, it is unclear what caused the crash, if the helicopter — which Corcoran said was an EC-130 that could carry up to six people — was taking off or landing, if a distress call was made, and who was operating the aircraft.
An investigation is currently underway by the Federal Aviation Administration and the National Transportation Safety Board, Corcoran confirmed.
Though it is unclear who was driving the helicopter, WBIR reported that Jim was a longtime pilot and owned a helipad along the lake near his home that he used for easy access.
He and Joe owned a Knoxville-based auto dealership together — which Joe eventually took over — before Jim went on to found a manufactured housing company called Clayton Homes in 1966, which made millions for their family, according to the outlet.
Today, Clayton Homes is run by Jim's son Kevin Clayton. The company was acquired into Warren Buffett's family of holdings under the Berkshire Hathaway name in the early 2000s, WBIR reported.
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