Police believe the killer of a promising young boxer lay in wait while he visited a friend.
Eamonn Magee Jnr, whose father - also called Eamonn - is a former WBU welterweight champion, was stabbed multiple times in the garden of a house in West Belfast.
The attack happened as the 22-year-old engineering student went to check on a pizza delivery during the early hours of Saturday morning.
A main line of inquiry is that the boxer was killed in a jealous rage by a love rival.
A 32-year-old man was arrested on suspicion of murder a few hours after the brutal attack. He remained in police custody last night for questioning.
"There appears to have been a row between the victim and a man, over a woman. This resulted in the murder of Eamonn Magee Jnr. He didn't stand a chance," a source close to the murder investigation said.
Detective Chief Inspector John McVea, who is leading the murder hunt, said: "Nobody would have known that Eamonn would have been coming out of the house to look for the pizza delivery, therefore we believe that the person was lying in wait for Eamonn as he would have come out of the house."
His distraught father Eamonn Snr said: "He was my blue-eyed boy, he was such a lovely guy, and I just can't believe it. I got a call at 3am.
"No father expects a call like that. I keep asking why it happened and can't come up with an answer."