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Police officer. He had been in the police force for only six months. Although off-duty he gave chase on his motorcycle to Liam Quinn, who was fleeing after being approached by other officers. Tibble attempted to block his path, but was shot twice and died later in hospital. Quinn was part of a Provisional I.R.A. group, running a bomb factory. He was eventually arrested in the U.S.A. and extradited to Britain thirteen years later. He was sentenced to life imprisonment, but was released in 1999 as part of the Good Friday Agreement. Tibble was posthumously awarded the Queen's Police Medal for gallantry.