The attorney representing Joseph Wood, convicted in 1989 of the murders of his girlfriend and her father, said his client died an agonising death after being injected with a cocktail of medications that were supposed to quietly snuff out his life.
"It took Joseph Wood two hours to die, and he gasped and struggled to breathe for about an hour and forty minutes," attorney Dale Baich said after the execution in the southwestern US state yesterday.
Baich said in a statement that Wood had been injected with a mixture of two drugs - midazolam combined with hydromorphone - an experimental cocktail that badly failed.
"Arizona appears to have joined several other states who have been responsible for an entirely preventable horror - a bungled execution," the attorney wrote.
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So drawn-out was the procedure to execute Wood that his attorneys had sufficient time while it was going on to write up and file a court motion seeking to interrupt it.
"Tonight, we learned that yet another American has been put to death in a shocking and cruel way. But the worst part about Joseph Wood's botched execution was, it was entirely predictable and avoidable," said Diann Rust-Tierney, executive director of the National Coalition to Abolish the Death Penalty.
"The combination of drugs used in putting Wood to death - an agonising, two hour ordeal - has been used only once before, earlier this year in Ohio, resulting in another botched execution," she said.
Wood, 55, was sentenced to die for the 1989 shooting deaths of his 29-year-old former girlfriend Debbie Dietz and her father Gene, 55.
He had filed a court petition challenging his execution, in which he demanded to know more about the state's lethal injection method, the executioner's qualifications and the manufacturer of the lethal drugs.