ATHENS – A 60-year-old former inmate released from jail despite being convicted of two murders was shot dead himself by unknown gunmen in the Greek capital's neighborhood of Kallithea around 5 a.m. on Oct. 5, police said.

He was identified as Evangelos Pallis, who built a notorious reputation under his nickname “Apache,” said Kathimerini, which reported he was active in organizing riots while in prisons, convicted of murders in 1995 and 2002.

The paper said he also had developed ties with local anarchist groups but police didn't reveal any motive for the killing which they said is being investigated.

There have been a number of murders of people in Athens and the area who had ties to organized crime, said to be likely retributions between rivals in bloody shootouts.