 There were previous security breaches in connection with INLA prisoners in nearby Maghaberry prison, and McWilliams was among a number of INLA prisoners transferred from Maghaberry to the Maze.It was while McWilliams was at Maghaberry that he had joined the INLA.On 27 December 1997, McWilliams shot and killed LVF leader Billy Wright, known as "King Rat".