The state acknowledged the pentobarbital would expire up to 45 days after being compounded into an injectable fluid, rather than the 90 days it originally said.
The state Supreme Court ruled that Brad Sigmon and Freddie Owens have a statutory right to choose the manner of their execution.
Execution by nitrogen hypoxia is authorized under Alabama law, but the state has never put it into practice.
South Carolina is set to carry out its first executions in a decade due to a new law that compels condemned inmates to choose between the electric chair and a firing squad if lethal injection drugs aren't available.
Zane Michael Floyd had "exhausted his legal remedies," a judge has said, allowing prosecutors to set a date for the convicted mass murderer's execution.
State lawmakers approved a bill that will require condemned inmates to choose between dying in the electric chair or by a firing squad if lethal injection drugs aren't available.
Arizona Attorney General Mark Brnovich's office said it has asked the Arizona Supreme Court to set a briefing schedule before filing execution warrants.
Under current law, executions in the state must be carried out by lethal injection unless an inmate chooses electrocution.
Thirteen death row inmates were put to death in seven months after the Trump administration resumed federal executions last July.
The "Ghost Adventures" host purchased paintings and other items that once belonged to the killer from his stepdaughter.
"The four murderers whose executions are scheduled today have received full and fair proceedings under our Constitution and laws," said Attorney General William Barr in a Monday statement.
That the integrity of drugs in states' hands would be unreliable is a concern, but Dr. Joel Zivot says that states should be disclosing "if what they have is expired."
If put to death on Friday, Lee Hall will be the fourth person in Tennessee to choose the electric chair over lethal injection within the past year.
"This is not a happy night. This is the end of a horror story," the McLennan County District Attorney said.
The inmates argued that the state has the means to orchestrate their deaths by firing squad.
Rodney Scott Berget was executed by lethal injection for a 2011 murder during a failed attempt to escape from jail.
Three days before his scheduled execution, convicted killer Edmund Zagorski convinced Tennessee's Supreme Court to spare him death by lethal injection in favor of the electric chair.
Carey Dean Moore has been on death row for almost 40 years.
Bible, 66, was executed on Wednesday in Huntsville.
Oklahoma is one of many states attempting to move beyond lethal injection as a method of execution.
The ACLU said that in attaining a DEA registration to import drugs, Nebraska listed a licensed prison pharmacy that's not located where the drugs will be used for the executions.
Capital punishment cases are down but five of the 23 executions this year still highlight the arguments of those who oppose the death penalty.
An opioid at the heart of America's drug epidemic will be used for death row executions in Nevada and Nebraska if the never-before-tried combination of drugs is approved.