Tulsa County District Attorney Steve Kunzweiler says federal authorities are refusing to transfer a prisoner who is set to be executed in Oklahoma in December.

John Hanson is currently serving life plus an 82-year sentence in federal prison for robbing a credit union in Tulsa back in 1999. Before that, he was sentenced to death for kidnapping and killing 77-year-old Mary Bowles and killing 44-year-old Jerald Therman.

Kunzweiler says the federal bureau of prisons claims it's not in the best interest to transfer Hanson.