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.

Greek authorities arrested the ex-wife of a UC Berkeley professor in connection with his murder in Athens earlier this month. Marketing professor Przemyslaw Jeziorski was fatally shot July 4 in the Agia Paraskevi district of Athens, authorities told Greek media outlet To Vima.

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