Last Puzzles (Sherlock Holmes Brain Teaser)

A guy is found dead in his living room in front of a mirror in semi naked state. The police begin with the investigation and come across some awkward facts. When the man was killed, the room was closed from the inside. There was no way any one would have come through the window. No signs of struggles were found on the scene. The pants of the guy were found on the floor with the belt still around it. There was a lot of blood around his dead body which indicated murder through a sharp object. But the forensic team could not find any incision on the body. Seeking all these facts, the police was unable to solve the mystery behind the murder. Sherlock Holmes was called and he deduced the method of murder. Can you? Spoiler Alert : Sherlock Season 3 Episode 2 (The Sign of Three)

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