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30 May 2015 Last updated at 20:40 BST
He was the son of former WBU welterweight champion Eamonn Magee Sr.
A 32-year-old man has been arrested in connection with the killing.
BBC Newsline's Lisa McAlister reports.
Tributes have been paid to boxer Eamonn Magee Jr who was murdered in a stabbing on the outskirts of west Belfast on Saturday morning.