Between 1971 and 1973, three young girls were raped, strangled, and killed in upstate New York. Each victim's first and last names started with the same letter, and their bodies were found in cities that started with the same letter of their names:
Carmen Colon in Churchville, Michelle Maenza in Macedon, and Wanda Walkowicz in Webster. These killings were known as the Alphabet murders. Though several hundred people were questioned, no one has ever been convicted of the crimes.
In 1981, Issei Sagawa shot and killed a woman in his apartment. He ate different parts of her body over a two-day period because he thought it would let him "absorb her beauty." He also had sex with her corpse. Later on, Sagawa tried to dispose of the leftovers in a lake in France, where he lived. He awaited trial for two years, was declared insane, and the charges against him were dropped. He ultimately became a mini-celebrity in Japan, where he couldn't be legally detained, so he remains free to this day.
Christine and Léa Papin were two French sisters and live-in maids. In 1933, after working for and living with the Lancelin family for seven years, they murdered Madame Lancelin and her daughter, Genevieve. Both were beaten and stabbed to the point where the bodies were practically unrecognizable. Their eyes were also gouged out. The police discovered the Papin sisters in their room, naked, in bed together with the murder weapon.