The body of Vassilis Stefanakos was found in the vehicle in Haidari, western Attica.
Greek Police forensics team have so far recovered 22 bullets shot from a Kalashnikov rifle at the scene and believe that an entire team of hitmen was involved.
The culprits were waiting for Stefanakos outside a building that he used, which housed a pastry workshop on the ground floor and the offices of a company trading in liquid gas on the upper floor.
In addition to the two men that shot Stefanakos, investigating officers believe that other individuals had been used to track the victim’s movements and signal to the shooters.
According to police sources, Stefanakos was not an easy target since he always moved about in an armored car with a bodyguard as an escort.
Stefanakos, described by Greek police as the “crime boss of crime bosses” had been sentenced to 21 years in prison in 2008 for morally instigating a series of murders and 14.5 years in 2006 for an illegal fuel trade protection racket and other criminal acts.
He was released after serving nine years in prison.
Among others, he had been accused as the person responsible for organizing the sensational escape by convicts Vassilis Paleokostas and Alket Rizaj from Korydallos prison using a helicopter.
With information from Athens News Agency