But the inmate's agony alone is highly unlikely to change minds about capital punishment in the most active US death-penalty states, where lawmakers say there is little political will to move against lethal injections, and a single execution gone wrong won't change that.
Oklahoma Rep Mike Christian, a Republican lawmaker who pushed to have state Supreme Court justices impeached for briefly halting Tuesday's execution, was unsparing.
"I realize this may sound harsh," Christian said, "but as a father and former lawman, I really don't care if it's by lethal injection, by the electric chair, firing squad, hanging, the guillotine or being fed to the lions."
Missouri Rep Paul Fitzwater, a Republican who chairs the state House's corrections committee, called the botched execution "horrible" and "definitely not humane" but said it had not sparked any calls for reform.
Oklahoma Gov Mary Fallin has stayed an upcoming execution as prison officials investigate, but she too reaffirmed her support for capital punishment.
President Barack Obama yesterday said the Oklahoma event highlighted problems with the death penalty and he's asking his attorney general for a review.
Surveys by Gallup indicate that support for the death penalty remains strong in the United States, though it has declined over the last 20 years, from 80 per cent in favor of capital punishment in 1992 to 60 per cent two years ago.
