Horrifying History on Instagram: "On August 28, 2013, 18-year-old Isabella Guzman committed a horrific and brutal murder in her family’s home in Aurora, Colorado. Following a period of escalating conflict with her mother, 46-year-old Yun Mi Hoy, Guzman sent a threatening text message that read: “You will pay.” Later that evening, she attacked her mother in a bathroom, stabbing her 79 times in the face and neck. Guzman, covered in blood, then walked calmly past her stepfather—who was unaware of t