Weir named Mid-Ulster UVF leader Robin " the Jackal " Jackson as the main gunman in the O'Dowd shootings . Investigating officers told Barney O'Dowd that Jackson was involved but they did not have enough evidence to charge him . Jackson was also named as having a key role in the 1974 Dublin car bombings , Miami Showband massacre and a series of sectarian killings . A number of sources claim he was an RUC Special Branch agent
Miami Showband massacre
Miami Showband killings
Reavey and O'Dowd killings