The governor of Tennessee announced that the head of the state's prison system will resign. This decision comes after a failed execution, that of Christa Pike. The governor made this statement on Saturday.

Further details about the resignation and the circumstances surrounding the failed execution are available from the source. The announcement was made by the governor, indicating a significant change in the leadership of Tennessee's prison system.

The reason for the resignation is linked to the failed execution, but additional information would be needed to understand the full context of the situation.