Barbara Mackle would regret answering the door in the early morning hours of Dec. 17, 1968. On the other side was a masked man, 23-year-old Gary Stephen Krist, who had been researching all of the intricate details of Babara’s life for the last several months. He forced her into the back of a car he had waiting around the corner and drove her out to a remote forested destination where he instructed her to climb into a fibreglass box at the bottom of a pit that had previously been dug. 

The box was expertly built to house a person for some time without them perishing and was fitted with an air pump, food, water laced with a sedative and a lamp. After Barbara climbed inside the box, she was buried alive, where she would remain for three days before being found. 

Miraculously, she survived the shocking kidnapping and burial underground, but the only thing more shocking was what would become of her captor.

Sources:

Gary Krist: The Einstein of Crime, By David Krajicek - TruTV.com

https://murderpedia.org/male.K/k/krist-gary-steven.htm

https://www.news-journalonline.com/story/news/crime/2017/12/20/kidnapping-with-deltona-ties-gripped-nation-50-years-ago/16772134007/

The full ransom letter: https://www.websleuths.com/forums/threads/a-real-3-page-ransom-note.25145/

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