Detectives investigating the death of a teenager in Co. Tyrone at the weekend have launched a formal murder investigation.
19 year old Jason McGovern from Monaghan died after being attacked during a night out with friends in Omagh.
Detectives are studying CCTV footage of the assault and are appealing for any witnesses to come forward.
They particularly want to hear from people who were in the area of the Terrace pub and Sally O'Briens nightclub - and two men who helped Jason into a taxi after he was punched and kicked.
Detective Chief Inspector Richard Harkness is leading the murder investigation: