Edward Wheeler Hall, an Episcopal priest, and Eleanor Mills, a member of his choir with whom he was having an affair, were both murdered on September 14, 1922, in Somerset, New Jersey, United States. To this day the case remains unsolved. 

Source Materials:

https://yalereview.org/article/hall-mills-murder-trial-1926

https://www.vanityfair.com/news/2022/09/the-birth-of-americas-true-crime-obsession

https://nymag.com/news/features/scandals/hall-mills-2012-4/

https://www.newyorker.com/books/double-take/a-sensational-murder-trial-in-the-newly-founded-new-yorker

https://www.nytimes.com/1964/02/02/archives/was-the-murderer-in-the-jury-box-the-minister-and-the-choir-singer.html

https://crimereads.com/the-murder-of-edward-hall-and-eleanor-mills-new-jerseys-original-crime-of-the-century/

https://www.nydailynews.com/news/justice-story/90-year-mystery-killed-pastor-choir-singer-article-1.1160659

https://www.historicmysteries.com/the-hall-mills-murders/