Casey was charged with possession of explosives, and was taken away to Castlereagh holding centre, where he was interrogated for information on his fellow volunteers in the IRA.[3][4][2] On 4 April 1989, two members of the Ulster Defence Association (UDA, a loyalist paramilitary group), wearing balaclavas and green army jackets, burst into his house and shot him with a shotgun and a pistol from close range as he slept.And even Democratic Unionist Party leader Ian Paisley condemned the killing as "a diabolical crime showing devilish viciousness" such was the lack of knowledge about Casey's IRA membership.[10] Soon after coming to office in 2010 Attorney General for Northern Ireland John Larkin ordered a new inquest into Casey's death.[4] The Ombudsman report also stated that in November 1989, a cache of documentation on several hundred Sinn Féin and suspected Provisional IRA members was found in the possession of an individual with links to the UDA/UFF.
Shamrock Park where Casey resided and the scene of his killing