February 3, 1928 - Glennon Engleman
A St. Louis dentist who used his professional respectability as cover, Engleman carried out a series of murders-for-hire spanning roughly two decades, often targeting victims whose deaths would yield insurance payouts to co-conspirators. The combination of a legitimate career, military background, and calculated financial motive made him a difficult target for investigators until patterns across the killings eventually drew scrutiny. He was ultimately convicted of multiple murders and died in prison.
From Wikipedia
Glennon Edward Engleman (February 6, 1927 – March 3, 1999) was an American dentist, contract killer, and serial killer. Engleman, a United States Army veteran and a St. Louis dentist, planned and carried out at least five murders for monetary gain over the course of 30 years. He was already serving two life sentences in a Missouri state prison when he pleaded guilty to the murder of a man and his wealthy parents in a separate contract killing that occurred in Illinois. Engleman was a sociopath, once stating that his talent was to kill without remorse, and he enjoyed planning and carrying out killings and disposing of the remains in order that it would net him financial rewards. His first known killing occurred in collaboration with his ex-wife. His ex-wife Ruth married another man, raised his life insurance and then Engleman killed him, both sharing the benefits. Later he would repeat these tactics for other murders.
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