Caddy was ordained a priest for the Archdiocese of Melbourne on 25 August 1990 at St Patrick’s Cathedral Melbourne, Victoria].[1] After serving as an assistant priest at Our Lady of Perpetual Help, Maidstone, he went to Rome in 1993 to study for a Baccalaureate and later a Liceniate in Social Sciences at the Pontifical Gregorian University.[2]
He returned to Melbourne and served as a prison chaplain. He was administrator of CatholicCare Victoria from 2004 to 2017. He served as parish priest of All Saints, Fitzroy from 2014 to 2016, before being appointed to St Mary's, Saint Kilda East from 2016 to 2019. He was appointed Episcopal Vicar for Social Services in 2016 and Vicar General in 2019, while also serving as parish priest of Saint Carthage's, Parkville from 2021.[4]
On 6 June 2024, Pope Francis announced Caddy had been appointed Bishop of Cairns.[4] The seat had been vacant since 2022 following the resignation of Bishop James Foley, after being diagnosed with Parkinson's disease, in 2019.[6]
Caddy was ordained and installed as the eighth Bishop of Cairns at St Monica's War Memorial Cathedral on 15 August 2024, by Brisbane Archbishop Mark Coleridge.[7]