On August 9th, 1970, in Ogunquit, Maine, a bright and sunny Sunday had begun. The Olenchuk family was going about their day to day life in the bustling summer town. Thirteen-year-old Mary had attended church earlier that day, and with temperatures in the '80s, the family decided to spend the rest of the day at Little Beach, which was just a short distance away from their summer home. At around 4 pm, Mary decided to leave her mother, Ruth, and her two older sisters Nancy and Jane at the beach. Barefooted, She hopped on her black Hercules English racing bike and rode the short distance to her home. She was seen again at 5:00, this time by an older woman on the Lookout Hotel's third floor. She first spotted the red-headed girl talking to a man in a faded maroon car, possibly a 1967 Chevrolet with scratches on the hood. The man was white of average height and build and looked to be in his 30s. 
 The woman looked away for a short while, and when she returned her gaze, Mary was now in the vehicle with the man. She appeared to be smiling and laughing. The stranger then backed his car from the road into the hotel's entryway and drove off in the other direction. This is the last time anyone would ever see 13-year-old Mary alive.
If you have any information about the death of Mary Olenchuk, please contact the Maine State Police at 1-800-228-0857.
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SOURCES:
The Bangor Daily News from August 9th, 1970-November 18, 2000 provided by Newspapers.com
https://www.washingtonpost.com/archive/local/2000/10/19/gen-peter-olenchuk-munitions-expert-dies/eeea6303-4eaa-4bef-891d-5e39833786e1/
https://www.washingtonpost.com/archive/local/1998/08/29/obituaries/b22db7a4-e4be-4f25-a7fb-aecb2b952dfc/
https://murderpedia.org/male.P/p/pierce-charles.htm
https://www.reddit.com/r/UnresolvedMysteries/comments/27foaq/maines_oldest_cold_case_the_murder_of_13_year_old/
https://downeast.com/features/unsolved-crimes-closure/
http://oakhillresearch.blogspot.com/2016/08/raymond-trimmer-jr-and-sr.html
https://www.maine.gov/tools/whatsnew/index.php?topic=state_police_unsolved&id=10804&v=article2018
pierce-charles.htm
https://counteverymystery.blogspot.com/2020/05/murder-of-judith-e-hand.html
https://www.tapatalk.com/groups/missing87975/unsolved-child-murder-mary-catherine-olenchuk-t2319.html
https://www.websleuths.com/forums/threads/me-mary-catherine-olenchuk-13-ogunquit-9-aug-1970.295367/
http://justiceforunsolvedinmaine.blogspot.com/2015/03/red-rover-by-alex-ferguson.html