We see him put the gun in his mouth, we hear the gun shot, we see him dead and surrounded by blood. But the camera moves too quickly to Sherlock’s reaction to see whether he pulled the trigger or not. Is it possible that the sound of the shot came from somewhere else nearby and the rest was the work of Jim’s brilliance and blood packets? At first I didn’t think there was any chance Moriarty lived. But now, after seeing some tweets from Gatiss and his husband, and this, I’m thinking there may be.