Authorities in Tennessee were unable to execute Krista Pike for a 1995 murder despite administering two doses of the lethal drug. A death-penalty expert called the incident an unprecedented failure, reports the Associated Press.

According to Pike’s attorneys, after the lethal injection, the woman “was alive and snoring loudly.” The death-row inmate was taken from the prison by ambulance.

The execution of 50-year-old Krista Pike, who was convicted of murdering a fellow student when she was 18, was scheduled for the morning of September 30. Had the execution taken place, she would have become the first woman executed in Tennessee in more than 200 years.

An appeals court halted the administration of the lethal injection just one hour before the procedure was to begin, but several hours later the U.S. Supreme Court overturned that decision. As a result, authorities administered two doses of pentobarbital to Pike, her attorneys said.

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