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COLUMBUS, Ohio -- A condemned Ohio killer facing execution next week by an untried lethal drug process has asked the U.S. Supreme Court for a reprieve.

Attorneys for Dennis McGuire argue that thanks to poor legal representation the jury that sentenced McGuire to death never got to hear the full extent of McGuire's troubled childhood.

The request late Wednesday is separate from McGuire's argument in a lower court that the two-drug combination will cause him "agony and terror" as he struggles to catch his breath.

The filing with the Supreme Court says jurors never learned that McGuire was malnourished, had to regularly steal food and was frequently beaten as a boy.

A message was left with the Ohio Attorney General's Office, which is expected to oppose the filing.

McGuire, 53, is scheduled to die Jan. 16 for the 1989 killing of Joy Stewart in Preble County in western Ohio.