Greek police have brought five people in for questioning in the case of murdered UC Berkeley professor Przemyslaw Jeziorski, who was shot dead on July 4 while visiting Athens to see his children and attend a family custody hearing.

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.

The ex-wife of a UC Berkeley professor shot to death while in Greece was arrested along with several alleged accomplices in the killing, Greek media reported.