In July of 1940, the body of a strangled woman was discovered floating in Crescent Lake in Olympic National Park, Washington.  The cold water preserved the body, but the flesh had turned into a soap-like substance.  It took a while, but a dentist was finally able to identify the woman as Hallie Latham Illingworth.  She had been missing since shortly before Christmas in 1937 and investigators arrested her husband, Monty Illingworth.

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Resources:

• Amazon.com: The Lady of the Lake eBook : Amundson, Mavis: Kindle Store
• The Mysterious Lake Crescent Ghost Stories WereWoofs.com
• interlocutory decree | law | Britannica
• The Lady of the Lake - Hallie Illingworth • Morbidology
• The Macabre Crime Mystery of the Lake Lady whose Skin had Turned into Soap (thevintagenews.com)
• Monty Illingworth Archives - Deranged LA Crimes ®Deranged LA Crimes ®
• Lake Crescent - Wikipedia
• How Does Water Affect Human Body Decomposition? - Xtreme Cleaners
• Expedition Magazine - Penn Museum
• Soap on a Bone: How Corpse Wax Forms - Atlas Obscura