Christa Gail Pike was supposed to become the first woman executed by Tennessee in more than two centuries.

Instead, she survived.

The 50-year-old death-row prisoner remained alive after Tennessee officials administered two doses of pentobarbital Wednesday night in an attempted lethal injection that has now triggered an investigation, a statewide halt to executions and renewed scrutiny of the state’s execution protocol.

Pike was transported from Riverbend Maximum Security Institution to an outside medical facility after the execution procedure failed.

Her lawyers said Thursday that she was in critical condition and receiving life-saving treatment.

The extraordinary outcome sharply changes the story surrounding an execution that had already attracted national attention.

Before Wednesday, online videos and articles circulated graphic simulations purporting to show what would happen inside Pike’s body during lethal injection.

Some described a three-drug sequence involving pentobarbital, a paralytic drug and potassium chloride.

But that was not Tennessee’s current execution protocol.

Tennessee revised its procedures in December 2024 and adopted a single-drug method using pentobarbital. The Department of Correction says the drug is intended to cause death without the additional paralytic and heart-stopping chemicals used in older three-drug protocols.

What happened Wednesday demonstrated just how unpredictable the real procedure could become.

According to the Associated Press, members of the execution team had difficulty establishing intravenous access.

Pike’s attorneys said she had multiple needle marks and at points remained conscious while staff worked to place the lines.

Those difficulties were particularly notable because Pike and her lawyers had warned beforehand that obtaining IV access could be complicated.

She had publicly expressed fear that the execution team would have trouble finding usable veins and had cited Tennessee’s previously aborted attempt to execute another prisoner, Tony Carruthers.

Carruthers’ May execution was abandoned after officials spent roughly 90 minutes trying unsuccessfully to establish the second IV line required under the protocol.

Pike’s lawyers had also argued in court that a blood condition could increase the risks she faced during lethal injection.

During an August hearing, experts disputed whether her thrombocytosis — an abnormally high platelet count — created an elevated danger of IV complications or pulmonary edema.

The state maintained that her veins were accessible and that pentobarbital would render her unconscious before she experienced severe pain.

Wednesday night did not go according to plan.

Tennessee officials administered two doses of pentobarbital, but Pike remained alive.

Witnesses and her attorneys described periods of gasping and loud snoring before emergency personnel eventually transported her from the prison.

The Tennessee Department of Correction initially defended its actions.

In a statement issued shortly before midnight, the department said it had followed “every step” of the state’s established execution protocol.

Officials said the protocol did not permit additional procedures after those already carried out and confirmed that Pike had been taken to an off-site medical facility.

By Thursday, the fallout had escalated.

Tennessee Gov. Bill Lee called what happened “deeply disturbing” and suspended the state’s remaining executions while an outside investigation examines the failed procedure.

Pike’s attorneys have described the attempted execution as “chemical torture” and are calling for her death sentence to be commuted to life imprisonment.

The state has not accepted that characterization, and an investigation will now examine exactly why the procedure failed.

The episode is highly unusual even within the troubled history of lethal injection.

The Death Penalty Information Center said Pike’s case appears unprecedented in the modern era because she survived after the execution drugs themselves had already been administered.

Pentobarbital is a powerful barbiturate used by multiple states for executions.

Supporters of single-drug protocols argue that a sufficiently large dose rapidly causes unconsciousness followed by respiratory and cardiac failure.

Critics have challenged whether the process reliably prevents severe suffering, pointing particularly to evidence of pulmonary edema found in some executed prisoners.

Those competing claims have been litigated repeatedly across the United States.

Pike was sentenced to death for the 1995 murder of 19-year-old Colleen Slemmer.

Pike was 18 at the time.

Prosecutors said Pike, then participating in a Knoxville Job Corps program, helped lure Slemmer to an isolated location before she was tortured and killed.

A Tennessee jury convicted Pike of first-degree murder and conspiracy and sentenced her to death in 1996.

Her lawyers had made repeated attempts to stop Wednesday’s execution.

They emphasized Pike’s age at the time of the crime, her documented history of childhood abuse and mental illness, and advances in understanding adolescent brain development.

Pike had also expressed remorse for Slemmer’s murder.

Slemmer’s mother, however, opposed clemency and continued to support carrying out the sentence, describing the enormous loss her family had endured.

Gov. Lee declined Pike’s clemency request, and late legal efforts failed to prevent the execution attempt from beginning.

The U.S. Supreme Court allowed Tennessee to proceed Wednesday.

Pike therefore entered the execution chamber expected to become the first woman put to death by Tennessee since the early 19th century.

Instead, hours later, an ambulance took her away alive.

Her medical condition remains serious.

The investigation into what happened has only begun.

And the graphic simulations circulating before the execution now look particularly misleading.

They depicted a controlled sequence in which drugs predictably shut down breathing and the heart.

Tennessee’s actual protocol involved only pentobarbital.

And in Pike’s case, even after the state administered the lethal-injection drugs called for by that protocol, the planned ending never came.