Alabama's aborted execution last week of an inmate with severely compromised veins led to more than ten puncture wounds in the man from failed needle placements and left behind a bloodied death chamber, his lawyer said.
On Thursday, Alabama tried to execute by lethal injection convicted murderer Doyle Hamm, 61, who has spent more than half his life on death row.
After about two-and-a-half hours of trying, the state called it off because of issues with Hamm's veins it said could not be resolved before a death warrant expired at midnight.
Hamm’s lawyer described it as a gory and botched execution.
They gave up when they could not find a vein, Bernard Harcourt, a professor at the Columbia University Law School, said.
The execution has come under federal court review, with a US district judge calling for the state to preserve evidence, including the clothes Hamm was wearing.
States including Oklahoma and Arizona have also conducted botched executions that raised questions about death chamber protocols in the 31 US states with capital punishment.
"I wouldn’t necessarily characterise what we had tonight as a problem," Jeff Dunn, Alabama Department of Corrections commissioner, told reporters shortly after the execution was called off.
There were two sets of medical personnel who tried to place a line in Hamm's groin area or in an area between his knees and feet, Mr Harcourt said, adding the inmate, who was examined by a doctor after the execution attempt, had at least 12 puncture wounds.
In court filings in the days before the planned execution, Hamm's lawyers said he had terminal cancer and a history of intravenous drug use that had severely compromised his veins.
They said Alabama was rushing through a specialised execution protocol, increasing the chances of a flawed procedure.
The state responded at the time it knew what it was doing and could handle the lethal injection. It has not indicated if it will seek a new execution date.
The plan called for the insertion of intravenous catheters into Hamm's leg or central vein, legal papers showed.
"Our case was that this would be tortuous and bloody and they wouldn’t succeed," Mr Harcourt said.
