Keddie murders

The Keddie Murders an unsolved American murder of 4 people that happened in Keddie, California. The murders took place in Cabin 28 of the Keddie Resort during the late evening of April 11, 1981, or early the following morning. 
The victims were Glenna Sue Sharp (née Davis), known as Sue (age 36), her son John (age 15), and his friend, Dana Wingate (age 17). 
At some time after the crime was discovered, Sue's daughter, Tina (age 12), was reported missing. Her skull and several other bones were recovered in 1984 in Camp Eighteen, California, which is in Butte County.
The case still remains unsolved. In 2004, Cabin 28 was demolished.