Killer dies of Heart Attack after lethal Injection meant to execute him didn't work (Photo)

The execution of a death row inmate, Clayton Lockett,went wrong after he died of a heart attack.Clayton who was sentenced to death for shooting a 19-year-old Perry woman(right) and watching his friends bury her alive, was to die by use of three experimental drugs.He received the entire cocktail of injections - which had never been tried in Oklahoma before - but for some reason the drugs didn't kill him.

Oklahoma Department of Corrections director Robert Patton said the inmate was writhing on the gurney and shaking uncontrollably about 13 minutes into the execution.

The execution began at 6:23 p.m. when officials started to inject the first drug, and a doctor declared Lockett to be unconscious at 6:33 p.m.About three minutes later, though, Lockett began breathing heavily, writhing on the gurney, clenching his teeth and straining to lift his head off the pillow.At 6.37p.m., Lockett sat up and said 'something's wrong.'
After about three minutes, a doctor lifted the sheet that was covering Lockett to examine the injection site. After that, an official who was inside the death chamber lowered the blinds, preventing those in the viewing room from seeing what was happening.

Patton then made a series of phone calls before calling a halt to the execution.The inmate finally suffered a massive heart attack and died at 7.06p.m.