 On 22 February 2004, Tyrrell made his senior debut in a 1–10 to 0–15 defeat by Waterford in the opening round of the league.He was a regular starter during that league campaign, however, he played no part in the subsequent championship.Kilkenny were back in form in 2005, with Tyrrell winning a first National League medal following a huge 3–20 to 0–15 victory over Clare.