TODAY | April 30, 2014
>>> 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.