Members of the family of James and Michelle Butler have confirmed the arrest of Adam Curtis Williams in Jalisco.
He's the man accused of stealing a truck and trailer belonging to the New Hampshire couple who were found buried in a shallow grave last week on Padre Island.
Earlier, reports came from Piedras Negras television station Super Channel 12 about the arrest.
The Kleberg County Sheriff's Department issued an arrest warrant for Williams yesterday.
He is wanted for felony theft.
Williams is believed to have fled to Mexico along with Amanda Noverr.
It's not clear if Noverr was also detained.
She has not been charged in this case but is considered a person of interest.
Local law enforcement agencies have not confirmed the arrest of Williams.