Prince George, British Columbia - Helen Claire Frost was reported missing by her sister on October 15, 1970, having failed to return home from a walk two days earlier.
Helen Frost was born in Reigate, England on October 17, 1952 to parents Dennis and Daphne Frost. She had an older sister named Sandy. Her father was a green beret in the British Commando Brigade for 12 years, and worked on the docks in London during World War II.
In 1956, the family moved to Nanaimo, British Columbia, Canada. After the move, Dennis worked for the city of Nanaimo as a sweeper operator.
Helen's family was stable and her mother and father were married for 67 years, until Dennis died on July 20, 2014. Sandy described them as "good parents despite the head-strong actions of their two rebellious teenage girls.
Helen moved to Prince George, British Columbia in 1969, and Sandy joined her in November of that year. They shared an apartment on the 1600 block of Queensway, along with a woman named Darlene and her infant child.
In the spring of 1970, Helen went to a home for unwed mothers in Kamloops where she gave birth to a daughter, Sandra Jeanette, on May 13th of that year. Shortly afterwards, she returned to Prince George and her baby was taken into government custody.
She unsuccessfully tried to regain custody of the baby in the summer of 1970. Sandy recalled that Helen came out of the social worker's office, "just bawling her eyes out, and we never talked about it again."
Sometime between the birth of her child and her disappearance, her relationship with the father of the child, Stefan Grumpner, dissolved. She worked a number of odd jobs while she was in Prince George, including a busser at the Hudson's Bay Company cafeteria, and a gas station painter for a company that operated between Prince George and Prince Rupert.
Helen was single at the time of her disappearance. She had given birth to her daughter, Sandra Jeanette, on May 13, 1970 in Kamloops and moved to Prince George shortly afterwards.
When she disappeared, Helen was wearing a three-quarter length, navy-blue nylon coat with a fake fur-trimmed hood and blue pants. Sandy reported that Helen left behind money, clothes, and identification at their apartment.
Her whereabouts remain unknown.