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. A United States Army veteran, he planned and carried out at least five murders for monetary gain over 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 in Illinois. Engleman was a sociopath, who once stated that his talent was killing without remorse, and that he enjoyed planning and carrying out killings and disposing of the remains for financial rewards. His first known killing occurred in collaboration with his ex-wife, Ruth. She remarried and took out a lucrative life insurance policy on her new husband, after which point Engleman killed him and the two split the settlement. Engleman would use this as his template for his later murders.

Engleman used his wealth, sexual magnetism, and charisma to manipulate women around him— ex-wives, lovers, and his dental assistant — into helping him formulate and carry out elaborate murder schemes.

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