Yusuf Nazlioglu, 40, was shot at least eight times by a man with a pistol in the underground car park of his apartment on June 27, 2022 at Rhodes in Sydney's inner west.
He died the following day.
Abdulrahman Atteya, 31, Mohammed Hosni Khaled, 27, and Mohammed Baltagi, 26, have all been charged with murder as part of a joint criminal agreement to kill Mr Nazlioglu.
Each has pleaded not guilty in the NSW Supreme Court.
As the murder trial continued on Thursday, Mr Nazlioglu's widow Jade Jeske, formerly Jade Heffer, told the jury she saw her husband shot in front of her.
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."
Atteya or another man Rabieh Baltagi - who fled Australia in July 2022 - are alleged to have been in the VW Golf, with prosecutors saying either could have been the shooter.
Khaled and Mohammed Baltagi were not present at the time but are accused of helping plan the murder.
On Monday, crown prosecutor Eric Balodis told the jury a possible motive for the murder was the theft of two rented vehicles.
About a week and a half before the shooting, Mr Nazlioglu and Ms Jeske rented two luxury Mercedes-Benz cars from a business in Lansdale, in western Sydney.
The three accused murderers had connections with those at the rental business, the jury heard previously.
Ms Jeske told jurors on Thursday that her husband's friend Issa Ghananim had asked them to rent the vehicles and not return them.
This was meant to be payback to a girl at the company who had allegedly stolen a vehicle from Mr Ghananim while he was in prison, Ms Jeske said.
After the rented cars were not returned, the owners of the car business sent threats to Ms Jeske and her family, the court heard.
"Return the car before the situation is escalated (car reported stolen) or worse," a message sent to Ms Jeske's sister read.
The widow said that when she picked up the first rented Mercedes, she allowed the company to take a photo of her driver's licence which included the Rhodes address.
"At that point in time, I didn't actually believe they wouldn't return (the cars)," she told the court.
Tracking devices from the vehicles were removed with one of them later listed for sale on Facebook Marketplace for $1500, the jury heard.
The trial continues.
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