Weir identified Jackson as the gunman in many shootings , including those of Strathern , PIRA volunteer John Francis Green , and three members of the O'Dowd family . Shortly before the killing of a Roman Catholic RUC sergeant , Jim Campbell , in February 1977 , Weir was at Jackson 's home when he had been invited to accompany Jackson on a mission to kill a Catholic RUC officer which Jackson claimed had been arranged by Billy McCaughey and a Special Branch officer . Weir had turned down the offer , and Campbell was shot dead outside the Cushendall RUC station as he locked up . He also linked Jackson to the 1975 Kay 's Tavern bombing in Dundalk . While in prison , Weir wrote a letter to a friend in which he suggested that Jackson had links to British Intelligence Corps and Captain Robert Nairac
three members of the O'Dowd family
Reavey and O'Dowd killings
John Weir (loyalist)