Months before Przemyslaw Jeziorski, a marketing professor from the University of California, Berkeley, was killed, he filed a restraining order against his ex-wife.

Greek officials say the broad-daylight attack came one day after a custody hearing over the victim's 10-year-old twins.

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.