On February 23, 2016, 18-year-old Kaitlin Buckner of Glendale, Arizona, was fatally wounded during an attack that devastated her family. A recent Ironwood High School graduate studying at Gateway Community College, Kaitlin had plans to become an ultrasound technician and was described as looking forward to a future with a family of her own.

According to reports, the violence began when Kaitlin’s 26-year-old brother, Alex Buckner, opened fire inside the family home near 51st Avenue and Cactus. Callers from inside the house identified Alex as the shooter; the residence was also set on fire. First responders entered the burning house, pulled Kaitlin out, and rushed her to hospital, where she later died. Her parents, Vic, 50, and Kimberly, 49, and her 6-year-old sister, Emma, were found dead at the scene. Officers later confronted Alex inside the home and shot him during the incident.

Family members said Alex had a history of drug use and severe mental illness, including schizophrenia. What details about the events that night remain unclear to the public?