It was while McWilliams was at
Maghaberry prison that he had joined the INLA. In June 1997, McWilliams was among INLA prisoners then transferred to H-Block 6 in the Maze prison following the attempted killing of Kevin McAlorum, an associate of
Hugh Torney. On 27 December 1997, McWilliams shot and killed LVF leader
Billy Wright, known as "King Rat". Early in 1997 INLA inmates within the Maze prison had informed
prison officers that "they intend, given a chance, to take out the LVF". The
Prison Officers' Association said precautions had been put in place to ensure inmates from the two organisations did not come into contact with each other as the factions were not participating in ceasefires at the time, and were violently opposed to one another. Their prisoners, however, were housed in the same prison block – H-Block 6 and, despite any precautions that may have been taken, on 27 December 1997 an INLA team, armed with smuggled pistols and led by McWilliams and including John Kennaway and John "Sonny" Glennon, scaled the roof of A wing and dropped to the forecourt outside H Block 6. The three men immediately ambushed Wright in a prison van as it was taking him for a visit with his girlfriend and son. While Kennaway restrained the van's driver, and with Glennon covering him, he slid open the rear door where Wright sat with another loyalist prisoner, Norman Green, and a prison officer. With an alleged smile on his face, McWilliams shouted the words: "Armed INLA volunteers" and pointed his pistol (a Hungarian
PA-63 semi-automatic) at Wright, who instantly stood up and kicked out at McWilliams. As Green and the officer threw themselves onto the floor for safety, McWilliams opened fire on Wright. Wright, despite being shot, continued to kick and lash out; McWilliams then climbed into the van and kept on firing at Wright, hitting him a total of seven times. Wright died of the final shot which lacerated his aorta. The three men then returned to their wing and surrendered to prison officers. On 20 October 1998 they were convicted of murder and possession of a firearm and ammunition with intent to endanger life. They were sentenced to life imprisonment for the murder and twenty years for the firearms offence, but served only two years in jail due to the early release provisions of the
Good Friday Agreement. ==The Cory Collusion Inquiry==