lethal injection

Calif. Dep. of Corrections and Rehabilitation

Today, the U.S. Supreme Court will hear arguments on the three-drug combination used in Oklahoma executions.

At issue is whether the use of one of the drugs, Midazolam, constitutes cruel and unusual punishment, since it is not proven to prevent the person being executed from feeling pain.

Update at 8:19 p.m. ET. Execution Fails:

According to reporters tweeting from inside the Oklahoma State Penitentiary in McAlester, Oklahoma, the execution of Clayton D. Lockett has failed. Lockett died of a heart attack after the execution was aborted.

The execution of Charles Warner, which was supposed to take place at 9 p.m. ET., was stayed by Corrections Director Robert Patton.

According to the AP reporter on the scene, about 34 minutes after the execution was scheduled to begin, Lockett was still conscious.

Calif. Dep. of Corrections and Rehabilitation

This week, Oklahoma's Supreme Court stopped the executions of two convicted murderers. At issue: where the state gets its execution drugs. The state does not want to reveal its source.  

Texas also has long kept its lethal drug suppliers secret, although Attorney General Greg Abbott recently issued an opinion stating it's time to go public.  But as death penalty opponents increase the pressure to expose suppliers and to disrupt the supply of the drug, some states are reviewing their options on capital punishment.