From the BBC:

At a short ceremony led by (Hrant) Dink's close friends and family, crowds of people marked his murder at 1457 (1257 GMT) on 19 January 2007 with a moment of silence outside the offices of the Agos newspaper (in Istanbul).

You are here for justice today - a scream for justice rises from your silence
Rakel Dink
Protesters in Istanbul with slogans "We are all Hrant Dink. We are all Armenians"
The murder triggered widespread anger and shock in Turkey

Dozens of carnations and candles were laid at the spot where the 53-year-old died. ...

The murder of Mr Dink triggered widespread anger and shock in Turkey, and caused massive crowds to take to the streets, chanting: "We are all Armenians, we are all Hrant Dinks."

Mr Dink was a hate figure for extreme (Turkish) nationalists and had received death threats before he was killed.

He was well-known for writing articles about the mass killing of hundreds of thousands of Armenians by the Ottoman Turks in 1915.