The death of Clayton Darrell Lockett occurred on April 29, 2014, when he suffered a heart attack during an execution by lethal injection in the U.S. state of Oklahoma. Lockett, aged 38, was convicted in 2000 of murder, rape, and kidnapping.

Lockett was administered an untested mixture of drugs that had not previously been used for executions in the United States.

Although the execution was stopped, Lockett died 43 minutes after being sedated. He writhed, groaned, convulsed, and spoke during the process and attempted to rise from the execution table fourteen minutes into the procedure, despite having been declared unconscious.

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Clayton Lockett tasered before bungled lethal injection

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Clayton Lockett
Mugshot of Lockett
Born	Clayton Darrell Lockett November 22, 1975
Died	April 29, 2014 (aged 38) Oklahoma State Penitentiary,McAlester, Oklahoma
Cause of death	Heart attack (following an execution attempt by lethal injection)
Occupation	Criminal
Criminal penalty