Tennessee death row inmate Christa Pike is in "critical condition, receiving life-saving care" at hospital, after surviving two lethal injection attempts, leading the state's governor to halt all executions for the year.

"We don't have a sense of her prognosis or much update on her health at the moment," her lawyer Randy Spivey told reporters on Thursday. "But we do know that that she is alive right now."

Her lawyers are now asking for her sentence to be commuted. Pike, 50, was sentenced to death in 1996 for the murder of Colleen Slemmer.

She was injected with two lethal doses of pentobarbital on Wednesday but remained alive, her lawyers said. She was then sent to hospital in an ambulance.

Pike was 18 when she and her then-boyfriend, Tadaryl Shipp, beat, tortured and killed 19-year-old Slemmer.

Her attempted execution on Wednesday was the subject of a last-minute legal battle. This culminated in the US Supreme Court allowing the lethal injections to go ahead.

Slemmer's mother May Martinez, who was among those who wanted the execution to take place and who travelled to Tennessee to witness it, told NBC News after the botched attempt that "it was a mess".

On Thursday afternoon, Pike's lawyers offered more details about what happened during the attempted execution, describing a harrowing scene shrouded in secrecy.

"Last night, the execution team attempted to establish an IV line for an hour," Spivey said. "I counted at least seven needles used in her left arm alone, one of which appeared to be bent when it was pulled from her arm after an unsuccessful attempt."

Spivey said that observers were kept in a dark room behind a closed curtain, after the second lethal dose had been administered and "it was clear that Miss Pike was still breathing" minutes later.

"No one knew what was going on behind that curtain," Spivey said. "I had no idea when and if medical professionals began to assist."

Tennessee Governor Bill Lee has ordered an independent review and said on Thursday the investigation into Pike's botched execution "will be thorough", adding that "it's going to take time".

"There are a lot of questions," Lee said. "The people of our state deserve to have those questions answered, and that's what this investigation is for."

Lee has not made clear who will conduct the independent review of the state's execution procedures.

His order to pause all executions will overlap with the planned 3 December execution of convicted murderer Gary Sutton.

The Tennessee Department of Correction, which handled the execution, issued a statement defending its handling of the case.

It said in a statement that it "followed every step of the State's lawful, established execution protocol approved by the attorney general's office".

"The lethal injection chemical in the protocol has consistently been effective, and the protocol does not allow for additional procedures beyond what was carried out this evening."

Pike was given two doses of the chemical pentobarbital, as per state protocol when the first attempt fails, but was still alive afterwards, according to court filings by her lawyers.

"This execution is causing Ms Pike unnecessary agony and occurring in violation of his right to be executed free of cruel and unusual punishment," her lawyers said.

The Tennessee attorney general's office said in a statement that it agreed with the decision to call for an investigation, adding: "We need to know what happened."

US Republican Senator Marsha Blackburn, who is running for Tennessee governor, described the situation as "tragic".

"While there should be a thorough review of what happened and why the process failed, the answer is simple: bring back the electric chair," Blackburn said.

Democrat Jerri Green, Blackburn's opponent, criticised her for wanting to "bring back one of the most cruel forms of capital punishment".

"As governor, I would put a moratorium on all future executions," Green said on X.

This is the second time in 2026 Tennessee officials attempted and failed to execute a prisoner.

In May, the execution of Tony Carruthers was called off after staff were unable to find a vein to administer a lethal drug. Carruthers was given a one-year reprieve.

With additional reporting by Stephanie Hegarty, World Service correspondent