John Wayne Gacy raped, tortured and murdered at least 33 teenage boys and young men, in most instances burying them in the crawl space beneath his home in the Chicago suburbs.
Colleen Harris said the first time she shot a partner, it had been self-defense. When another husband turned up dead, she insisted she couldn't remember the day.
Bill Beatty raised his stepson, Andrew Norman, from a young age, but he and his wife, Martha, started arguing about Norman once he became an adult. Those arguments soon turned deadly.