Boyd (31), who was serving the suspended part of his sentence for killing his sister when he fatally stabbed father-of-four Mark Carroll in the chest, was on Tuesday described by the victim's family as a "monster".

Michael Carroll was jailed by the Special Criminal Court in 2023 for opening fire on John Hutch in September 2016 and attempting to murder another man in early 2017.

The Special Criminal Court previously heard Michael Carroll (43) wanted to "ingratiate himself with organised criminals" due to his drug debts