The Laurel County Sheriff's Office said Stephen Eversole, 32, of London, hit a man in the face while wearing brass knuckles.
Investigators said the reported victim suffered multiple breaks in his skull and cuts to his face.
Investigators said Eversole was charged with Assault 1st Degree and Intimidating a Participant in the Legal Process.
Investigators also said Eversole was wanted on an outstanding warrant out of Laurel County.
He was lodged in the Laurel County Detention Center.