Ancestry has the record of his trial. England & Wales, Criminal Registers, 1791-1892, Gloucestershire, 1818.

He was tried at Gloucester at the Lent Assizes. His crime was sheep stealing and he was sentenced to death. A note below the sentence in the ledger states: Executed

There is also a record from the January Sessions 1817 at Gloucester where a John Hayward was sentenced to 9 months for Larceny. There were several John Hayward in the judicial system in Gloucestershire at the time, one being transported to Australia. I have no way of knowing if this record refers to John Hayward who was executed in 1818.