Police are appealing for information to assist in locating 34-year-old Glen Allen, who is currently unlawfully at large.
Allen, from Portrush, was convicted in 2010 in relation to the brutal murder of William Meek which occurred in June 2008 in the County Antrim town, and has since breached the conditions of his temporary prison release.
He is described as being approximately 5 ft 11 ins in height, of medium build, and has a fresh complexion.
He also has blue eyes, dirty fair hair, and scars on his right hand, his left finger, and his knee.
A police spokesperson said:
"Despite attempts to arrest Glen Allen, police have so far been unable to locate him. We are appealing to anyone who has seen him, or who knows of his whereabouts, not to approach him, but to contact police on 101 quoting reference 1452 of 14/12/22.
"Alternatively, information can also be provided to the independent charity Crimestoppers on 0800 555 111 which is 100% anonymous.
"Police would also appeal directly to Glen to hand himself in."