A marketing professor at the University of California, Berkeley has died, reportedly after being gunned down by a masked gunman while visiting Greece earlier this month.

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.

Our family is heartbroken, and we are doing everything we can to ensure that justice is served,’ his brother said