The BBC reports hundreds of protesters gathered in the square just hours after the suicide of Dimitris Christoulas, with petrol bombs thrown at police and tear gas fired in return.
Athens News reports that the demonstrators had organized themselves with social media, appearing under a banner that read "Let's not get used to death."
At the site of Christoulas' suicide sit many tributes, with flowers and one note reading "enough is enough."
The head of the Attica Pharmacists' Association Kostas Lourantos (of which Christoulas was formerly a member) released a statement that read:
"The way he chose is a statement of a political position and stance. If this man had killed himself at home there would not have been such a stir, as there had not been for the previous 1900 suicides. It is an incident that we must look at among many other incidents of suicide in our country, the country of sun and laughter."
Reports last year suggest that the Greek suicide rate rose at least 17 percent during the financial crisis.
WATCH BBC Footage of the scene:
