Alabama prison officials called off the execution of Kenneth Eugene Smith Thursday after they struggled to establish an IV line for his lethal injection. Alabama canceled another execution in September for the same reason.

This comes after an execution team in Arizona struggled Wednesday with the killing of a prisoner for the third time this year. Seventy-six-year-old Murray Hooper had always maintained his innocence after being convicted of murder and sentenced to death in 1983 without any DNA evidence, but was repeatedly denied DNA testing. After failing to insert an IV into Hooper’s arms, his executioners used a vein near his groin. Hooper reportedly turned to witnesses and said, “Can you believe this?”