Lethal injection table
Media playback is unsupported on your device
Video

Clayton Lockett: Oklahoma execution goes wrong

Prison officials in the US state of Oklahoma have halted an execution half way through, after botching the delivery of a new untested combination of drugs.

The prisoner, Clayton Lockett, was still said to be shaking uncontrollably 20 minutes after the first drug was administered. He later died of a heart attack.

Richard Lister reports.

Go to next video: Inmate 'spoke after lethal injection'