re: What is the most chilling unsolved murder mystery you know?

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The Keddie murders is an unsolved 1981 quadruple homicide in Keddie, California, a rural resort town in the Sierra Nevada. The victims were Glenna Susan "Sue" Sharp (née Davis; born March 29, 1945); daughter Tina Louise Sharp (born July 22, 1968); son, John Steven Sharp (born November 16, 1965); and John's friend, Dana Hall Wingate (born February 8, 1964).

The murders took place in house #28 of the Keddie Resort during the late evening of April 11, 1981 or early the following morning. The bodies of Sue, John, and Dana were found on the morning of April 12 by Sue's 14-year-old daughter, Sheila, who had been sleeping at a friend's house. Sue's two younger sons, Rick and Greg, as well as their friend Justin Smartt, were also in the house, but were unharmed. Tina was missing from the scene.

Tina remained a missing person until April 1984, when her skull and several other bones were recovered at Camp Eighteen, California, near Feather Falls in Butte County.

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