Lisa Montgomery has been put to death.

The U.S. Supreme Court ruled just before midnight that Montgomery’s execution could proceed. She was executed at 1:31 a.m. Montgomery was on the federal death row in Terre Haute for killing a pregnant woman and cutting her baby out of her stomach back in 2004. She is the first woman to be put to death in federal prison in 67 years.

A federal judge had granted Montgomery a stay of execution pending a competency hearing — just hours before she was scheduled to die on Tuesday, Jan. 12.

“The Court was right to put a stop to Lisa Montgomery’s execution,” her attorney, Kelley Henry, said in a statement. “As the court found, Mrs. Montgomery ‘made a strong showing’ of her current incompetence to be executed. Mrs. Montgomery has brain damage and severe mental illness that was exacerbated by the lifetime of sexual torture she suffered at the hands of caretakers.”