Many had spent weeks stranded at the border with Macedonia.
In November, the Balkan states began blocking passage to all migrants but Syrians, Iraqis and Afghans, whom they consider refugees.
The Moroccan man died after touching a high-voltage cable at Idomeni refugee camp.
They were among about 1,500 migrants who have been stranded near Greece's northern border town of Idomeni.
Over 3,500 people have been stranded at the Iodemi border since Monday
Migrants denied access have sewn their lips together and are refusing blankets
He allegedly entered Greece posing as a Syrian refugee.
The UNICEF goodwill ambassador met with Syrians en route to Northern Europe.
The International Organization for Migration said the figure rose from 4,500 a day during September.
The migration crisis is fanning old tensions in the Balkans, prompting a war of words in a region where bloody memories run deep.
There's an important distinction between the two groups, the U.N. says.
Between 3,000 and 4,000 refugees are entering Macedonia every day.
Germany is expecting 800,000 asylum seekers by the end of the year.
More than 5,000 people entered Serbia overnight as Macedonia cleared the backlog.
Macedonia declared a state of emergency in two border regions.
The Red Cross will allocate the spending to address humanitarian concerns.
A cottage industry for bikes has sprung up as illegal migrants attempt to make arduous journey by foot to EU countries.
While they were excavating a tomb in northern Greece, a 10-by-15-foot mosaic appeared