He also took on duties which were outside his official jurisdiction as a liaison officer – working undercover , for example . He apparently claimed to have visited pubs in Irish republican strongholds , sung Irish rebel songs and acquired the nickname " Danny Boy " . He was often driven to pubs by the future Conservative MP Patrick Mercer , who was then an army officer . Former SAS Warrant Officer Ken Connor , who was involved in the creation of 14 Int , wrote of him in his book , '' Ghost Force '' , p. 263 : Nairac finished his tour with 14th Int in mid-1975 and returned to his regiment in London , being promoted to Captain on 4 September 1975 . Following a rise in violence culminating in the Kingsmill massacre , British Army troop levels were increased and Nairac accepted a post again as a liaison officer back in Northern Ireland . On his fourth tour , Nairac was a liaison officer to the units based at Bessbrook Mill . It was during this time that he was abducted and killed
Kingsmill massacre
Kingsmill massacre
Robert Nairac