Suspected loyalist agent held liable for the unlawful killing of three Catholics Alan Oliver Brian Frizzell was hot dead by the UVF in Craigavon in 1991 A court has issued an order against a suspected loyalist agent holding him liable for the unlawful killing of three Catholics in Co Armagh. The judgment has been issued in respect of mid Ulster loyalists Alan Oliver, Anthony McNeill and Thomas Harper. Oliver is a suspected British agent who played a central role in the Mid Ulster UVF, which was responsible for dozens of sectarian murders. Along with McNeill and Harper, Oliver has have been linked to a gun attack on a mobile shop in the Drumbeg estate in Craigavon in 1991 which claimed the lives of Eileen Duffy (19), Katrina Rennie (16) and Brian Frizzell (29).