Yusuf Nazlioglu, 40, died a day after being shot at least eight times by a man with a pistol in the underground car park of his apartment at Rhodes in Sydney's inner west on June 27, 2022.
Mohammed Hosni Khaled, 27, Abdulrahman Atteya, 31, and Mohammed Baltagi, 26, were charged with forming a joint criminal agreement to kill Mr Nazlioglu.
They faced a combined weeks-long trial in the NSW Supreme Court after pleading not guilty to the charges.
After deliberating for almost a week, the 12 jurors found Khaled responsible for the murder on Monday afternoon.
"Guilty," the jury foreperson announced.
Khaled was not present at the time of the shooting but prosecutors alleged he and Baltagi helped plan Mr Nazlioglu's murder.
On Monday, the jurors determined the case against him was proven.
However, they are yet to return verdicts for Baltagi or Atteya.
Prosecutors allege the shooting was carried out either by Atteya or another man Rabieh Baltagi - who fled Australia in July 2022.
During the trial, Mr Nazlioglu's widow Jade Jeske, formerly Jade Heffer, described seeing her husband shot in the car park.
She said she saw someone covering his head running with a pistol towards her husband as he stood next to their car.
Ms Jeske ducked under the dash to hide as she heard eight successive gunshots and then a further two, the jury heard.
As the shooter fled to a waiting VW Golf, she filmed what was happening on her phone before turning to her husband.
"He was lying on his back," she said.
"Gauging by the amount of shots that I heard ... I knew that he was going to be dead."
The jury heard her husband's killing may have been motivated by the theft of two rented luxury vehicles from a business in Lansdale, in western Sydney.
The court were told the three accused murderers had connections at the rental business.
The jury will continue to deliberate on the verdicts for Atteya and Baltagi on Tuesday.
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