A man is now assisting police after CCTV footage was released of a sickening one-punch assault outside a Tuggeranong pub last month.
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But ACT Policing said investigations are continuing into the attack outside PJ O'Reilly's in Greenway on February 28 and are still calling for witnesses to come forward.
CCTV footage released on Facebook, which has been viewed almost 50,000 times, showed the man peeling off his t-shirt before approaching his victim and pummelling him into the outside wall of the pub.
Police said the offender asked to borrow a cigarette lighter before punching the victim in the face.
The man continued his "unprovoked attack" before bystanders intervened and broke up the fight, an ACT Policing spokesperson said.
The offender fled the scene accompanied by another man and woman.
Police later attended and found the man with facial injuries.
When asked why details of the assault had been released to the public nearly four weeks after it happened, an ACT Policing spokesman said:
"Police have been actively investigating this matter in order to locate and contact witnesses to assist in the identification of the alleged offender.
"Police are now seeking the public's help in the identification of the alleged male offender appearing in the attached footage."
It is the second time an alleged "coward punch" outside PJ O'Reilly's has hit the headlines this year.
In January, police revealed they were searching for a man who punched another man to the ground outside the pub in December.
There were about 68 assaults reported to police in Greenway in 2015.
Also in January, a man underwent emergency surgery to his jaw after an alleged one-punch assault outside the East Row Supa 24 convenience store in Civic, shortly before 3am on New Year's Day.
That incident sparked renewed debate over the territory's response to alcohol-fuelled violence and prompted calls for tougher one-punch laws - a move that has been resisted by Attorney-General Simon Corbell.
Anyone who witnessed the attack or who can identify the offender is urged to contact Crime Stoppers on 1800 333 000, or via at act.crimestoppers.com.au.
