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Oklahoma prison guards Tasered a defiant Clayton Lockett early Tuesday, and medical personnel had trouble finding a suitable vein for the lethal drugs that eventually killed him that evening, the head of the Corrections Department reported Thursday.

Lockett also deliberately cut his right arm before dawn Tuesday and was treated at a prison hospital, but the wound did not require stitches.

About 12 hours later, as they prepared Lockett for execution, medical personnel could not find a usable vein in his arms, legs, feet or neck, finally inserting the needle in his groin.

Corrections Department Director Robert Patton made the disclosures in a timeline provided to Gov. Mary Fallin, who ordered a review of the murderer's botched execution. Lockett writhed and convulsed as the three-drug cocktail was being administered, and he ultimately died of a heart attack 43 minutes later.

Patton also recommended that the execution of Charles Warner, who was to have died two hours after Lockett, be postponed indefinitely.

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