Murphy joined the Catalans Dragons club at the end of 2004 when the club was in the national French competition. He quickly established himself as one of the better players, topping the try scoring charts and helping the club become the first French team to go through a season without defeat, winning the Coupe de France and the French championship where he was man of the match in the Final. It was his first full season in Super League that saw him shoot to prominence. He finished as Top try-scorer in 2006's Super League XI with 26 tries and also making the Super League "Dream Team" despite his team, the Catalans Dragons coming bottom of the table.
In 2007, Murphy rose to public attention after suffering a spectacular injury in a match against Wigan Warriors. While running to try and claim a chip kick, he was pushed innocuously in the back by Pat Richards and went flying towards the advertising hoardings which surround the pitch. Trying to jump over the danger, his feet caught the hoardings and his neck and back were slammed into the concrete steps at the bottom of the stand. Murphy played on for almost an hour before eventually being substituted, where it was revealed he had broken ribs and he was subsequently sidelined for 6 weeks.
- Round 22: 15, 16 August queensland.rleague.com
- "France dominated by Dragons". Sky Sports. 2008-08-07. http://www.skysports.com/story/0,19528,12196_3949078,00.html. Retrieved 2008-08-08.
- "France name official squad". RLWC2008. 2008-09-24. http://www.rlwc08.com/news/news/archive/2008/09/24/france-name-official-squad.aspx. Retrieved 2008-10-03.
- Rookie Warriors squad named for Titans trial nzherald.co.nz, 4 February 2014