Charlie O'Neill (53) - who is believed to have died suddenly at his Ballymun residence - was discovered by a member of his family.
His death was not being treated as suspicious by gardai.
The low-level dealer was believed to be involved in the trade up until his death. A source told the Herald he was seen cycling in his area just hours before his death.
"He was going around the place on his bike selling tablets, just like he had been for years," a source said. "O'Neill's death will not be mourned by many in the Ballymun and Finglas areas."
He was injured in a bungled shooting on Glasnevin Avenue two years ago.
The bungling hitman who targeted O’Neill shot himself in the thigh by mistake before shooting his victim. It is understood he tried to pull a shotgun out of his tracksuit bottoms and shot himself.
Despite shooting himself he still managed to shoot O’Neill in the stomach but the veteran criminal survived the attack.
Following the attack the gunman hobbled down a laneway into nearby Hillcrest Park where he collapsed outside a home.
O’Neill was not a major criminal but had a long list convictions for offences ranging from threatening to kill to drugs, criminal damage, reckless endangerment and dangerous driving.
He had been targeted by drugs cops in north Dublin on several occasions and was suspected of being involved in low-level dealing.
He received a four-year suspended sentence in 2007 after he threatened to kill his estranged wife Barbara at her new home before leading gardai on a high-speed car chase with his seven-year-old son in the back seat.
The court heard he picked up a knife in his wife Barbara’s kitchen during an argument and told her: “I’ll put this in your head.”