The widow of a security guard shot dead in Sydney's CBD made an emotional appeal for help in finding her husband's killers.
Gary Allibon's distraught wife, Monica Allibon, says she used to pray every night he would come home safely from work.
"We were very close, we lived for each other as well as the rest of our family and friends," she told reporters in Sydney.
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"I feel like I've lost part of my body." Mrs Allibon described her husband as a "gentleman" who was "not a confrontational sort of person".
"He was no pushover but he'd never confront anyone on purpose, especially in a situation like that," she said, adding that if he had been wearing a security vest he might be alive today.
The Chubb guard and his two colleagues were ambushed at about 6am (AEST) on MOnday by four armed robbers wearing balaclavas and carrying two firearms.
Mr Allibon was shot at close range in the lobby of the building and rushed to the Royal Prince Alfred Hospital where helater died.
Detective Acting Superintendent Greg Antonjuk said he believed the "callous" crime was the work of professionals.
"I don't believe there was anything done by security officers that should have provoked the consequences of what we're dealing with today," he said.
Mrs Allibon said her husband received counselling after he was involved in an armed robbery three years ago, but chose to continue working, despite friends urging him to find another job.
"He just went back and did what he did and life just went on and I'd just thank God every day that he'd come home to me."
Mr Allibon was due to retire after his 60th birthday in February and the childless couple planned to travel, celebrate their 25th wedding anniversary and enjoy a "nice comfortable retirement".
"I do believe what goes around comes around, so hopefully there is a justice at the end of this," Ms Allibon said.
Breaking down in tears, she appealed for anyone with information "just anything that would help solve this murder" to contact police.
They are hunting for a silver Audi, which may have been stolen and are collating CCTV footage from the incident.
"You're talking about a more determined type of criminal group that have to go through significant planning and organisation to go about committing these offences," Det Supt Antonjuk said.
"They don't happen by accident and they are not random and they are not incidental."
Allibon, 59, from the Sutherland region, was shot in the chest by one of four armed robbers as he delivered cash to a commercial complex on Sussex St.
