According to the report, the front wheel assembly collapsed as the vehicle reportedly approached speeds of 885 kilometres per hour.
The wreck occurred at the Alvord Desert dry lake bed in southern OR while Combs was behind the wheel of the North American Eagle Super Sonic Speed Challenger, a 52,000-horsepower turbine-jet-powered vehicle.
"Based on the evidence collected and examined at the scene of the crash and the evidence recovered by the North American Race Team it appears that there was a mechanical failure of the front wheel, most likely caused from striking an object on the desert", Lieutenant Brian Needham said in a press release.
An investigation of the crash revealed blunt force trauma was the cause of Combs' death. A fire quickly engulfed the jet-powered vehicle after the crash.
In September, the Petersen Automotive Museum in Los Angeles debuted a special temporary exhibit dedicated to Combs curated with the help of her family and friends.
Following her death, the Jessi Combs Foundation was established.
Combs, 39, shared a post to her Instagram three days before her death with a caption saying that she was aiming to reach 619 miles per hour.
Outside of TV, Combs competed in a range of racing venues. "The Jessi Combs Foundation will motivate young women who looked up to Jessi, empowering them to uncover their inner confidence and abilities so they, too, can achieve their dreams". Combs is also noted for TV shows such as The List: 1001 Car Things to do Before You Die, All Girls Garage, Overhaulin' and Mythbusters.