Police are trying to establish the identity of a man who plunged to his death from a public housing block in Tsing Yi yesterday. The man, thought to be aged about 60, was found unconscious outside On To House, in Cheung On Estate, at about 12.30pm. He was certified dead when ambulancemen arrived. Police said a suicide note was found on the man, but refused to give further details. Initial investigation showed he had jumped from a staircase somewhere between the 14th and 15th floors of the building.