On the morning of July 4, an American marketing professor was walking towards his ex-wife’s house in Athens to pick up their two young children. It should have been an unremarkable, if strained visit – the couple had apparently been disputing the terms of custody arrangements.

Greek police have arrested at least five people in connection with the killing of a UC Berkeley professor, including the professor’s ex-wife, according to CNN and local news reports.

Przemyslaw Jeziorski, a native of Poland who taught at the Haas School of Business at UC Berkeley, was shot on July 4 in Agia Paraskevi, a suburb of the Greek capital of Athens, Greek outlet Ta Nea reported, citing Hellenic Police’s accounts.