"You know what would be funny, if we killed this guy," Pei Lui allegedly said before commencing a sustained and vicious attack on 25-year-old Tao Cheng then stealing his phone.
Mr Cheng's body was found in the stairwell leading to the 24-hour FBI Gaming cafe in the Sydney CBD on December 7, 2022.
"Mr Lui bashed Mr Cheng by punching, hitting, kicking and stomping on (him)," crown prosecutor Christopher Taylor said as a NSW Supreme Court trial opened in May.
Blood was on the walls and floor, and the 25-year-old's trouser pockets had been turned inside out.
Lui, now 31, was found guilty of manslaughter but acquitted of murder over the killing by a jury on Friday.
Mr Taylor failed to persuade the jury that the gamer had an intention to kill at the time of the incident.
Details of the violent attack can be revealed after strict non-publication orders over the identity of his co-offender were finalised on Tuesday.
As the trial opened, Mr Taylor said the brutal attack unfolded over a two-hour period three days before Mr Cheng's body was discovered.
Lui and another man - now known by the the pseudonym John Henry - were initially charged with murder.
Both men were captured on CCTV footage, played during Lui's trial, walking in and out of the fire stairwell during the attack.
Lui's barrister John Stratton SC attempted to pin the blame on Henry, saying he had fled the state after seeing publicity about Mr Cheng's death.
Mr Taylor told the jury the men had poured cleaning products and used a fire hose on Mr Cheng while he was either dead or unconscious.
The pair then took the homeless man's phone and left to go clubbing.
On the way there, Lui struck an unknown homeless man as they walked through Hyde Park, the prosecutor said.
"Mr Lui pushed the homeless male to the ground and punched him to his face," he told the jury.
They then danced for two hours at a club before going for a kebab.
Lui was arrested on December 16, 2022 and Henry was picked up by police in Queensland four days later.
After a jury was discharged at his trial, Henry's plea of guilty to manslaughter was accepted by prosecutors.
He was sentenced in December to six years behind bars with a non-parole period of three years and three months.
Lui will face a sentence hearing on August 7.
16°C