According to the University of Ulster's CAIN Project, the group were responsible for one death during the conflict. In 2001 members of the UYM attacked and killed Trevor Lowry in Newtownabbey, believing him to be a Roman Catholic. It was later discovered that Lowry was a Protestant. Of the two convicted for his murder one, Harry Speers, was significantly over the usual UYM age limits but was in fact commander of the Glengormley UYM and had direct responsibility for preparing UYM members for the transition to the UDA. However, as well as Lowry's murder, according to Henry McDonald and Jim Cusack, a UYM member also killed the UDA's Stephen Audley on 17 March 1991 after the pair fought over a handgun at a party, with the weapon discharging during the struggle and killing Audley.