It’s rare for governors to step in to halt executions. In the case of Robert Roberson, it ended up being state lawmakers who took extraordinary steps.

Texas state lawmakers subpoenaed Roberson to testify in a bid to block his execution in a case centered on “shaken baby syndrome” science that has since been refuted.

The Texas Supreme Court late Thursday night blocked the execution of Robert Roberson III, directing state officials to allow the death row inmate to comply with a subpoena issued by a House committee for his testimony.

A man whose execution was halted will testify Monday about Texas' "junk science" law, which many say should have already saved him.

The effort to spare Roberson sparked a conflict between the state’s top courts that must be resolved. When it is, the death row inmate will likely be back on the path to execution.