It's believed 19 year old Jason McGovern was attacked twice during a night out in Omagh Co. Tyrone on Sunday - first in a pub on John Street at around midnight - and then outside a nightclub on the Kevlin Road at around 2am.
He made his way to his friend's flat in Emyvale Co. Monaghan - where he was found dead on New Years Eve.
Post mortem results found he died from severe head injuries.
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Omagh Town Councillor Paddy McGowan says it's vital this man who the PSNI are seeking - comes forward - and helps police with their enquiries.
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