The man, who other media outlets have named as John Peter Latorre, was found just after 4.30am on Tuesday outside a home in Buchanan Place in the Melbourne suburb of Greenvale.
John Latorre, a fruit and vegetable wholesaler, is the brother of Vincent Latorre who an inquest in 2007 found had either killed or aided in the death of 20-year-old Rocky Iaria, whose body was found dumped in an occupied grave at Pine Lodge Cemetery.
Mr Iaria was last seen alive on September 6, 1991.
Almost six-and-a-half years later, Mr Iaria’s body was unearthed at Pine Lodge Cemetery when a gravedigger reopened a grave for a second burial.
His body had been wrapped in plastic and doused in lime, and his hands were tied behind his back.
A post-mortem examination found he died from a gunshot wound.
In August 2006, Coroner Paresa Spanos named Shepparton East fruit grower Vincent Latorre as having killed Mr Iaria or contributed to his death.
Vincent Latorre was jailed for more than a decade in 2009 for blackmailing business rivals and squeezing them for hundreds of thousands of dollars.
On Tuesday he was seen visiting the scene of his brother’s shooting, hugging and standing among a group of people.
Detective Senior Sergeant Danny Travaglini said the 64-year-old victim of this week’s ambush was walking out of his garage to his driveway to go to work when he was shot a number of times in the upper body.
“As he exited his premises he was approached by an unknown person, or persons, where he was shot,” Sgt Travaglini told reporters.
Paramedics tried to revive John Latorre but he was declared dead at the scene.
At least two of his family members were home at the time of the incident, with one relative discovering the victim.
Detectives have spoken to John Latorre’s family but said they were “quite distraught” and were not in a position to provide much detail.
The crime scene was expanded after initial inquiries suggested a car might have approached from a particular area, police said.
No arrests have been made as authorities look into the background of everyone involved or known to police, who lived in the area or associated with John Latorre.
– with AAP