The Ulster official was the referee at the centre of the controversy generated by Connacht wing Mack Hansen
Irish rugby referee Chris Busby is set for a shock retirement from professional rugby.
The Ulster official took charge of the recent interpro derby between Leinster and Connacht, after which Connacht star Mack Hansen took aim at the refereeing of his side.
According to the 42, Busby's decision is multifaceted and driven by personal reasons in the most part, although the Mack Hansen incident is believed to have been the tipping point in Busby making the decision.
Busby was due to officiate as an assistant referee for two games during the upcoming Six Nations.

Craig Casey Signs Two Year Contract Extension With Munster
Today's Fixture At Punchestown Cancelled Due To Storm Bram
Tuesday Morning Sports Update
Former Jockey Rachael Blackmore Receives Contribution To The Industry Award At 2025 Horse Racing Ireland Awards
Club Decision Sees Mohamed Salah Dropped For Champions League Trip To Milan
Monday Morning Sports Update
Daniel Wiffen Qualifies For 800-Metres Freestyle Final