Troubled Eagles footballer Murray Newman has been found guilty of a nightclub assault where he fractured the jaw of a man who had slept with his ex-girlfriend.
A District Court jury took less than three hours to find Newman guilty of assault occasioning grievous bodily harm to Brett Marris at the Library nightclub in Northbridge November last year.
Newman showed no visible reaction as the jury delivered its verdict.
Newman's Eagles teammates including Dean Cox, Jack Darling, Nic Naitanui and captain Darren Glass have all attended the trial.
Newman, 20, pleaded not guilty to the charge, claiming he was acting in self-defence when he punched Mr Marris.
The court was told Newman sent a string of Facebook messages to Mr Marris in the weeks leading up to the assault after learning his then-girlfriend had earlier slept with Mr Marris.
The messages included telling Mr Marris to start digging his own grave, that he would not rest until he hurt him, and asking him to fight anywhere, anytime, and calling Mr Marris a "little girl" when he told him to "go away".
The messages were sent on October 3 last year - the day he found out about the liaison - October 5 and then again weeks later on October 28.
Newman told his trial he had sent the "immature" messages because he was hurt and angry that the "love of his life" had slept with someone else.
But he denied that he had meant the messages.
He rejected suggestions he had been angry when he came across Mr Newman at the club, instead saying he had been scared.
"I was nervous and scared and I pretty much thought we were going to get into a fight... I thought he was going to hit me," he said.
But the jury rejected Newman's claim he had acted in self-defence.
It is not known yet what impact the conviction will have on the young footballer's career.
Newman has been granted bail ahead of sentencing in March.
His bail includes strict conditions that he not consumed alcohol or attend licensed premises unless for Eagles business.