An Englishman was charged on Tuesday with murdering a 43-year-old Greek in London, where the latter was on vacation.
Menelaos Alygizakis was struck over the head at a bus stop outside Waterloo Station in the early hours of Saturday.
He died from head injuries sustained during the attack.
Mark Patten, 30, was charged with murder.
Alygizakis, a teacher, had been visiting friends in the UK, where he had taught in the past.
The 43-year-old worked at Athens College between 2004 and 2007.