Police in Greece are searching for the killer of a University of California Berkeley professor who was shot and killed on July 4 while visiting Athens to see his children and attend a family custody hearing.

Przemyslaw Jeziorski, a marketing professor at UC Berkeley, was killed on a street near where his children live, his family said.

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.