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

The ex-wife of University of California, Berkeley professor Przemyslaw Jeziorski, who was gunned down in broad daylight in Greece earlier this month, has been arrested.

Przemyslaw Jeziorski, who taught quantitative marketing at the Haas School of Business, was shot several times on July 4 outside Athens, the authorities said.