 Following the Irish senior championships, Byrne then emigrated to Australia where he then turned professional and had his first pro fight in February 2006.Dean's unbeaten streak lasted until 28 October 2011.When, just 8 days after winning a Unanimous decision over Michael Frontin, Byrne took a major step up in class facing France's IBF International Light-Middleweight Champion, Frank Haroche Horta (then 26–8).