Christa Pike, the Tennessee death row inmate who survived the state's attempt to execute her by lethal injection, has been discharged from the hospital and returned to prison, her attorneys said Saturday.

Pike, 50, is back at the Debra K. Johnson Rehabilitation Center, the women's prison where she had been housed for 30 years, her attorneys said in a written statement.

"She is grateful to the first responders and her medical team for their care in these extraordinary circumstances. She is continuing to receive medical care at the prison, and we will continue to track her recovery," the statement said.

Pike had been hospitalized since Sept. 30, when she survived two doses of pentobarbital — a sedative that has become the primary drug used in U.S. lethal injections — administered as the state attempted to execute her for the 1995 beating and stabbing death of her classmate, Colleen Slemmer. At one point she was on a ventilator, and her attorneys said they did not expect her to survive. Instead, Pike woke up and began talking and walking with assistance.

According to the Death Penalty Information Center, Pike is the first person to survive after receiving lethal injection drugs during an execution.

The Tennessee Department of Correction has not explained what went wrong during the execution. Medical and lethal injection experts have focused on whether a problem with the IV line caused the drug to pool in her tissue rather than enter her bloodstream — a complication that can occur when a catheter slips out of a vein, and one long recognized even in routine medical care. In a court filing, Pike's attorneys wrote that "apparently at no point did any member of the execution team realize that the IV lines were not correctly placed."

The failed execution has brought renewed scrutiny to how Tennessee carries out death sentences. Gov. Bill Lee has since postponed the state's only other scheduled execution of the year and ordered a review of what went wrong. The state's prison chief resigned in the aftermath. With that execution now on hold, the outcome of Lee's review — and whether the Department of Correction offers a fuller public account of the misplaced IV lines — is likely to shape when, or whether, Tennessee carries out another execution.

According to accounts of the execution, Pike was asked whether she had a final statement as the process got underway and spoke of being at peace. About five minutes later, she raised her head and said her arm hurt. She later appeared to lose consciousness but could be heard breathing heavily until media witnesses were escorted from the witness room nearly 90 minutes into the execution. An ambulance then took her to a hospital.