Sophie Marie Barrera, a 50-year-old woman and owner of a dental laboratory, was killed on January 14, 1980, in St. Louis, Missouri. She had been embroiled in a financial dispute with a local dentist, Dr. Glennon Engleman, who owed her laboratory approximately $14,000 for services rendered. After Barrera filed a lawsuit to recover the debt and refused to settle for a lower amount, she became the target of a violent plot.
On the day of her death, Barrera was leaving her workplace in south S
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