Tennessee Governor Bill Lee declined to provide any new information Friday explaining his decision to call off the state’s first scheduled execution since the start of the pandemic, but said more details will likely be provided next week.

The night before, the Republican governor had issued a statement saying there had been an “oversight in preparation for lethal injection” as he granted a temporary reprieve to 72-year-old inmate Oscar Smith. An attorney for Smith, Amy Harwell, later told reporters that her office had been told there had been a “mishandling” of the drugs.

“I granted a temporary reprieve because of a technical oversight,” Lee told reporters on Friday. “I have high expectations for our departments, and the death penalty is a serious matter that requires attention to detail. We are digging into this, and I expect we will have more to report next week.”

Smith was convicted of the 1989 killings of his estranged wife and her two teenage sons. Shortly before the governor intervened, the U.S. Supreme Court had denied a last-hour bid by Smith’s attorneys for a stay.