A killer has been executed by lethal injection for the 1980 killings of two people despite claiming he was innocent.
Murray Hooper, 76, was killed at the state prison in Florence, Arizona at around 10.34am local time, for the killings of William "Pat" Redmond and his mother-in-law, Helen Phelps.
According to Arizona Department of Corrections Deputy Director Frank Strada, Arizona executed Hooper 34 minutes late due to difficulties inserting IVs into him.