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.

A UC Berkeley professor was gunned down in an Athens suburb just a day after a custody hearing—now, Greek police have brought his ex-wife and four others in for questioning as they probe what they say appears to be a contract killing,

Police arrested the ex-wife of a UC Berkeley professor for allegedly arranging his murder earlier this month in Athens, Greece, according to the victim's family.