LIVINGSTON COUNTY, Mich. -

An investigation has found a surprising twist in the Michigan roadway shootings investigation.

Authorities told Local 4 the only person hit by gunfire during the string of roadway shootings was not hit by a bullet belonging to a man charged in the shooting spree, Raulie Casteel.

The Delton man was shot in the back in October, 2012 while driving along Interstate 96 in Livingston County.

It was around the same time nearly two dozen cars were shot at in and around the area.

Police later arrested Raulie Casteel and charged him in many of the incidents.

Now, recent forensic tests show the bullet that hit the Delton man was not fired from any of Casteel's guns.

Prosecutors said this will not impact their case against Casteel because he was never charged in connection to that shooting.