Our interactive ranking shows who true crime fans think is the least intelligent serial killer — and see after you vote who actually had the lowest IQ.
Denver Emery, 18 and Nicholas Rivera brought 2-year-old Calvin Trullinger to the hospital showing signs of "abusive brain trauma" that police don't think was accidental.
Amber Guyger claims the apartment door was ajar and she only shot Botham Jean after he refused her verbal commands. Lawyers for his family say they've got witnesses that heard her knocking and screaming "Let me in!"