Ep 5. In 1986, while undertaking the burglary of a house, David Lewis was surprised by the return of the homeowner, 74-year-old Myrtle Ruby, fired a gun and shot her dead. US Federal law prohibits States from executing the mentally disabled, which is defined as somebody with an IQ score of below 70. David Lewis’ IQ score has been officially recorded at ‘between 71 and 85’ meaning he is classified as “borderline” mentally impaired. His defence argued alternative testing methods declared his IQ was lower than 70. See acast.com/privacy for privacy and opt-out information.