The victim, a 48-year-old man, was found dead in front of a car dealership in Sarakinados. He had been shot with a hunting rifle.
Police suspect that the two men had personal differences.
Meanwhile, a woman was found dead in her apartment in the Athens neighbourhood of Korydallos on Saturday. The woman had a neck wound and police are not ruling out any possibility at this stage.
The 39-year-old’s body was found by her daughter.