State lawmakers subpoenaed Roberson the night before his execution, prompting a historic appearance at a House committee hearing.

The Texas man will testify before the Committee on Criminal Jurisprudence of the Texas House of Representatives.

Robert Roberson, who had been set to be the first person in the U.S. to be put to death for a murder conviction tied to a diagnosis of shaken baby syndrome, had his execution delayed after a dramatic few hours of legal wrangling among three different Texas courts.