Career
He represented Placentia and St. Mary's in the Newfoundland and Labrador House of Assembly from 1865 to 1869 as a Conservative. Born in Placentia, O'Reilly was defeated when he ran for reelection in 1869. He served as a magistrate from 1877 until his death in Placentia in 1897.
He founded the local Star of the Sea Society in 1876 and was its President until his death.