This man is the latest to suffer a botched execution in the United States.

Joseph Wood -- an Arizona inmate -- took almost two hours to die by lethal injection.

His lawyers say he "gasped and snorted" before being pronounced dead.

During that time, lawyers said they appealed to multiple federal courts to have the execution halted and the client given life saving treatment.

The appeal was denied.

The convicted double murderer was one of six death row prisoners who sued Arizona last month, claiming that secrecy surrounding the drugs used in other botched executions violated his rights.

This latest failed execution is likely to raise yet more questions about the lethal injection and whether it is humane.