But they drove into the emergency bay and found another car with two panicked mates and a bloodied passenger.

As officers approached the car they spotted 32-year-old Safwan Charbaji's lifeless body in the front seat.

After the door was opened a handful of unspent bullets tumbled out of the dead man's lap and onto the concrete.

On the other side of the hospital was the man police had been called to.

Abdullah El Masri, 35, had been driven to the hospital separately. It is understood he was left there by a driver who fled the scene.

For the past two days detectives have attempted to piece together the bizarre and murky set of circumstances that left Mr Charbaji dead and Mr El Masri on life support.

Fairfax Media understands an outstanding debt dispute is one of the possible motives being investigated for the fatal shooting, which started with a fight outside a south western Sydney panel beaters.

Police were initially called to Ilma St in Condell Park on Saturday afternoon after neighbours reported people arguing and gunshots outside the A Team Body Work business.

The smash repairs is linked to well-known convicted criminal Walid "Wally" Ahmad.

Ahmad was jailed in 2005 after shooting dead Mayez Danny at a Greenacre wrecking yard in 2002.

At the time Ahmad was working as a bouncer at a King Cross nightclub owned by Hassan "Sam" Ibrahim.

Mr Danny had taken issue with Ahmad punching his nephew and breaking his jaw after refusing him entry into the DCM nightclub.

Ahmad later shot Mr Danny five times at a prearranged meeting at a Greenacre auto wreckers after an earlier truce between the two crumbled.

He was sentenced to a minimum of seven years jail for manslaughter and other assault-related offences.

Neighbouring business owners said they heard two groups of people arguing on Saturday in the industrial area before four to six gunshots rang out in the street.

"They were arguing inside the factory first," one nearby worker said.

"Then they started fighting each other around the gate. Then I think they had a rest and started again.

"It is quite normal to hear, we just didn't realise they would start shooting each other."

CCTV seized by police shows a number of people in a heated confrontation on the street for about half an hour before the shots were fired.

On Sunday police charged Mohamad Abul Hamid Elmir and Adam Sam Abboud, who arrived at hospital with Mr Charbaji, with concealing a serious indictable offence.

Police allege the pair did not tell them the whole truth about how their friend ended up with a bullet to the head and chest.

It is understood Elmir, 22, told police he was driving to the gym with his brother-in-law - Mr Charbaji - when someone fired shots from a passing car.

In a panic, he called his friend, Abboud, who happened to be at the Revesby McDonald's nearby.

Elmir picked Abboud up, he told police, and they decided Mr Charbaji needed medical treatment and rushed him to hospital.

While police alleged there was more going on behind the scenes than Elmir and Abboud were telling them, Magistrate John McIntosh said on Sunday in granting bail it was unknown what the men saw or knew.

The pair's lawyer, Ben Archbold said his clients, who would vigorously defend the charges, were traumatised.

"There are no winners in a situation like this," he said.

"They are pleased they got bail as they have the funeral of a brother-in-law and a friend to attend."

Mr Charbaji's heartbroken family are in the process of planning his funeral and gathered at his mother's Bankstown home on Monday to mourn together.

"They don't understand why this has happened," the family said in a statement.

"It is a completely senseless murder. We can't understand why he was targeted."

Mr El Masri remains in a critical but stable condition in Liverpool Hospital.

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