(CBS/AP) ALBANY, Ga. -- The NAACP is trying to block Monday's scheduled execution of a Georgia inmate set to die for killing another prisoner.
The state president of the National Association for the Advancement of Colored People, Edward DuBose, says Warren Hill is mentally disabled and shouldn't be put to death.
The group held rallies in Albany and other cities on Friday, and it's planning vigils on Monday asking Gov. Nathan Deal to block the execution.
Hill was serving a life sentence for killing his girlfriend when he was sentenced to die for the 1990 beating death of a fellow inmate.
Hill's lawyers have long argued that he's mentally disabled and shouldn't be put to death.
The state says Hill's mental disability hasn't been proven beyond a reasonable doubt.