
Police said Ivan Gressimanko, 31, jumped to his death from the roof of the 26-storey condominium located between Sois Sukhumvit 65 and 65/1.
They noticed that he had an apparent knife wound covered by a plaster on one of his wrists.
Police said he had stayed in a room on the 23rd floor alone for two years. They found no evidence of a fight inside the room.