Defense attorney challenges Oklahoma death penalty in client's murder case

LAWTON, Okla. - Defense attorney Cori Grayson is asking a judge to dismiss the death penalty in the murder trial of her client.

In light of recent failed executions, including the execution of Oklahoma inmate Clayton Lockett, Grayson says the use of lethal injections is an unconstitutional form of torture.

Grayson represents 35-year-old Armando Luna.

Luna has been charged with murder and conspiracy to commit murder in the June 2012 stabbing and beating death of Sonny Limpy at the Lawton Correctional Facility.

Luna has pleaded not guilty.

Prosecutors plan on seeking the death penalty in the case, citing that Luna was already serving a life sentence for killing a man in 2007.

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