[2] As O/C of the IPLO's Belfast Brigade O'Prey is believed to have been part of the hit team that killed outspoken Loyalist and UVF member George Seawright in November 1987.

[4] Probably the most infamous act he was involved in, was the Orange Cross Social Club shooting, in which a member of the Loyalist paramilitary the Red Hand Commando was killed and several others were injured.

"[5]On 16 August 1991 an Ulster Volunteer Force (UVF) team burst into his home in Ardmoulin Terrace on the Lower Falls in west Belfast.

Two UVF men broke into the back of O'Prey's home and found him on the sofa in his living room along with his daughter and a friend.

The UVF men fired shots at O'Prey killing him while he lay on the sofa, his daughter and the other man were unharmed.