|Position||Fullback, Five-eighth/Stand-off, Halfback/Scrum-half|
|As of 14 December 2008|
In 2000 he made his debut in the National Rugby League competition for the Auckland Warriors, who had a feeder agreement with the Magpies, starting at Fullback. He made three appearances for the team that year. When he was not selected for the Warriors he returned to the Souths Magpies or appeared for the Newtown Jets in the NSWRL Premier League, as both clubs had feeder agreements with the Warriors.
For the 2001 Season Mulhall was not re-signed by the Warriors and so he moved to the Wests Tigers. He stayed with the squad for two years but did not manage to play another game in the National Rugby League.
In 2003 he moved to France where he signed with the Toulouse club. While he had traditionally been a fullback in France he moved into the halves and often played at halfback or five eighth. In 2005 he was part of the history-making Toulouse side that reached the semi finals in the Challenge Cup, the first non British side to do so.
Since retiring at a young age, David has made a successful conversion into Business. He is currently the General Manager of Australian NRL team, the Wests Tigers. He is now widely regarded as "The Journeyman" of NRL administration.
- Lauiti'iti out injured The Press, 17 June 2000
- 2000 Queensland Cup Round One, rleague.com, 13 February 2000
- 2000 Queensland Cup Round Thirteen rleague.com, 20 May 2000
- "Rugby League: Toopi steps in as Warriors fullback tryout". The New Zealand Herald. 5 July 2000. Retrieved 27 September 2011.
- 2001 Player Movements[dead link] Darryl's Rugby League
- 2003 Player Movements[dead link] Darryl's Rugby League
- French League Results Wrap rleague.com, 8 October 2002
- Leeds keep French at bay The Telegraph, 1 August 2005
- Toulouse defeat Widnes to make Cup history The Independent, 27 June 2005