On the morning of July 4, an American marketing professor was walking towards his ex-wife’s house in Athens to pick up their two young children. It should have been an unremarkable, if strained visit – the couple had apparently been disputing the terms of custody arrangements.

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.

Greek police have arrested five people over the killing of a University of California at Berkeley professor who was shot dead in an Athens suburb earlier in July, police said.