As Monica Allibon stirred from her sleep on Friday morning her first thought was "four years ago today I was happy".
For the Sydney widow it's the day before the four-year anniversary of her husband's shooting death during an armed robbery in the city's CBD.
"That was my first thought," a tearful Ms Allibon told reporters.
"Four years ago today I was happy."
Police believe they know who is responsible for robbing Gary Allibon, a security guard, on June 7, 2010, but need a few more pieces of the puzzle to make an arrest.
Mr Allibon, 59, and a cash delivery van crew were loading an ATM on Sussex St in the early morning when three men jumped out of a silver Audi and confronted them.
One of the guards had cash and a gun taken from him.
Despite posing no threat to the offenders, Mr Allibon was shot by one of them, police say.
"He was shot in the back as he walked away," Detective Superintendent Luke Moore told reporters on Friday.
The suspects are believed to be tied to an organised criminal group and police have linked Mr Allibon's death to other crimes in Sydney.
Police say the silver Audi used in the shooting had been stolen from a car dealership in Rosebery in 2008.
Det Insp Moore, of the robbery and serious crime squad, said the car, which was spray-painted silver, was later found burnt out.
Police say it was also used in a shooting at Wentworthville in April 2009.
A BMW sedan, which was stolen during a violent car-jacking in Maroubra in July 2009, was also used by those involved in Mr Allibon's shooting.
Seven months later the car was found abandoned in a Liverpool car park.
A third luxury vehicle, a white BMW X5 has also been linked to the violent crime, however police have not found that car.
Det Supt Moore said police needed information about the cars to be able get over the line and arrest the suspects.
"I can't go into specifics of naming who those people are of course," he said.
"But certainly we believe we know who they are and the groups they are aligned to."
There is a $100,000 reward attached to the case.
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