TODAY

TODAY   |  April 30, 2014

Lethal injection stopped, Oklahoma inmate still dies

An investigation is underway into an Oklahoma execution that’s being called botched. The execution lasted nearly 30 minutes before the man died of a heart attack. NBC’s Janet Shamlian reports.

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>>> we move now to a disturbing story out of oklahoma overnight, what is being described as a botched execution. the inmate, clayton lockett, was being put to death for the murder of a 19-year-old woman, when something went wrong. here's nbc 's janet shamlian with the story.

>> reporter: lockett was set to be executed using a new experimental cocktail of three drugs. the execution began at 6:23 p.m ., when officialsed a mirsterred the first drug, a sedative to lockett.

>> at that time, we began pushing the second and third drugs in the protocol. there was some concern at that time that the drugs were not having the effect.

>> reporter: courtney francisco of nbc station kfor witnessing the execution, said prison officials declared lockett unconscious at 6:33 p.m . but over the next six minutes, eyewitnesss said lockett still appeared conscious and was struggling.

>> one of the things he said was "something's wrong." he said "man" at one point. he kept trying to raise up.

>> reporter: then eyewitnesss said prison officials closed off their window into the chamber, putting lockett's execution on hold.

>> it sounds as if the vein stopped working after the first drug was given so that the paralysis and the medication to stop the heart, they just never worked.

>> reporter: prison officials said lockett suffered a massive heart attack and died at 7:06 p.m . lockett's lawyer, who initially sued the state for refusing to disclose details about the execution drugs, said prison officials are to blame.

>> they wanted to hurry up and get it done with as little transparency as possible. this is what they get.

>> reporter: in a statement, oklahoma governor mary fallin called for "a full review of oklahoma's execution procedures." and ordered the execution of a second death row inmate, charles warner , to be delayed for 14 days. for "today," janet shamlian , nbc news, houston.