Christa Pike is "up and walking" though mentally "foggy" while in hospital after last week's botched attempt to execute her in the US state of Tennessee, her legal team says. Pike, 50, who was sentenced to death after murdering Colleen Slemmer with her then-boyfriend in 1995, survived two lethal injections on 30 September.

Experts described it as unprecedented. Speaking late on Wednesday to BBC Radio 4's Today programme, lawyer Stephen Ferrell said he had not spoken to Pike directly but had learned her arms were swollen and barely functioning as she took her first steps around her hospital room.

A court has ordered state officials to preserve all evidence related to the failed execution. That evidence could lay the groundwork for a future lawsuit against the state.

The Pike case is now in uncharted territory, as Pike is believed to be the only person to have survived an execution attempt by lethal injection. The failed execution was branded a "mess" by the mother of Slemmer, who was among those pushing for Pike to be put to death.

Pike's boyfriend at the time of Slemmer's gruesome murder, Tadaryl Shipp, was spared the death penalty because he was not legally an adult when the crime was committed. He remains in prison.

Pike was 18 and Shipp was 17 when they beat, tortured and killed 19-year-old Slemmer, whom they had met at a job training camp for low-income young people. In their previous updates on Pike's condition after the attempted execution, her team had said she was awake and speaking, and experiencing anger and confusion.

She was said at that stage to be handcuffed to her bed. Her lawyer Randy Spivey said after Wednesday's court hearing: " She cannot move either of her arms."

He added: " Both of her arms and hands are tremendously swollen, and we do not know what if any function she will regain in her arms." In the later updates, given on Wednesday to the BBC, Ferrell said Pike was continuing to experience the after-effects of the drug pentobarbital.

The drug was injected into her body in two doses by prison staff during the scheduled execution on 30 September. But once it became clear that Pike was not going to die from the execution attempt, she was taken to hospital, where she was initially unconscious and declared to be in a critical condition.

As of late on Wednesday, though, Pike was "fairly well", Ferrell said. " What's been described to me is that physically there's quite a bit going on, that her arms are very injured and she's not able to use them very much."