Texas high court halts the execution of a man whose conviction was tied to shaken baby syndrome diagnosis. Supporters say it was based on outdated science.

The stay came mere hours before Robert Roberson was poised to become the first person in the U.S. executed for a murder conviction linked to shaken baby syndrome.

The state’s highest civil court said it wants a lower court to resolve a separation-of-powers issue raised by a group of Texas lawmakers who subpoenaed the death row inmate the night before he was set to be put to death.