Christa Pike, convicted of murdering a schoolmate three decades ago, survived Tennessee’s effort to execute her by means of lethal injection late on Wednesday, prison officials said, foiling the state’s first attempt to put a woman to death in two centuries. Pike’s condition following the ordeal was not immediately known, and it was not clear what legal avenues her lawyers or the state might pursue ​next after she was ‌taken for medical treatment from the Riverbend Maximum Security Institution in Nashville.