A 16-year-old was fatally shot in the head in Brooklyn on Saturday night – and his killer is still on the loose, according to police. Cops responded to a 911 call on Eastern Parkway in Crown Heights around 8:47 p.m. and found the teen unresponsive and was pronounced dead at the scene by EMT’s, police said. The victim, identified as Tyson Harps of the Bronx, suffered a gunshot wound to the head.