Khalid Baker's friend has admitted he pushed a man who then fell through a window to his death and says he did not see the Melbourne boxer near the party brawl.
Baker served 13 years in prison for Albert Snowball's murder, after the 2005 incident following a fight inside a Brunswick warehouse.
He has launched an appeal, arguing his friend's evidence provides fresh and compelling reasons for his murder conviction to be overturned.
LM, who cannot be named for legal reasons, told the Court of Appeal he did not know where Baker was when he got into a fight with Mr Snowball at the party.
"I don't have a memory of Khalid Baker being on the landing when I had the altercation with Mr Snowball," LM said on Tuesday.
Mr Snowball died in hospital after falling 5.4 metres through a window after the brawl at the Brunswick warehouse 16 years ago.
A jury found Baker guilty of Snowball's murder in 2008 and he was sentenced to 17 years in prison. He was released in 2018 after serving his 12-year non-parole period.
LM was aged 17 when he went to the party with a group of friends, including Baker who was then aged 18.
He was dancing with Baker when a fight broke out at the back of the warehouse. LM ran over to try and break up the brawl as his other friend was involved.
LM pushed his friend away from the fight and tried to get him to walk down the stairs to leave, when Mr Snowball came out and started yelling.
Positioned between the two men, he said Mr Snowball punched him and LM then grabbed him by the chest and pushed him.
"After I pushed him he took a couple of steps, I only saw that in my peripheral as I was turning. I turned and went down the stairs straight away," he said.
He did not hear a glass window breaking and the next thing he remembered was walking outside and seeing Mr Snowball lying on the pavement.
Baker's barrister Julie Condon QC said LM's evidence would raise reasonable doubt in the minds of a jury as to whether her client was involved.
"His evidence gives rise to the probability that it was more likely that is was his acts that caused Mr Snowball to go out the window," she said.
However, prosecutor Elizabeth Ruddle QC said the evidence was not compelling since LM did not see what had happened after he walked down the stairs.
She said other eye witnesses saw Baker involved in a fight with Mr Snowball.
"Each of those witnesses have Mr Baker restrained on the landing as a significant fight takes place, having the chair in his hands, [LM] doesn't see any of this," she said.
Court of Appeal President Karin Emerton and Justices Phillip Priest and Richard Niall will hand down their decision at a later date.
