Anna Wheeler's Killer.

18-year-old Mildred Brewster left her parents' farm to make her own way in Montpelier, Vermont. She met and fell in love with a young man in her boarding house who seduced Mildred but did not return her affections. When Mildred learned that he was engaged to Annie Wheeler, she bought a revolver to take her rival's life as well as her own. She succeeded in killing Annie Wheeler but failed her suicide attempt. At her trial for premeditated murder, Mildred pled insanity.

Read the full story here: Insane Jealousy