Kirsten Elizabeth Hinckley was 15 and a sophomore at Brighton High School when she was killed at Trolley Square mall in Salt Lake City, Utah, on February 12, 2007. She was inside a card and gift shop with her mother when an 18-year-old gunman, identified as Sulejman Talović, began firing with a shotgun and a .38-caliber pistol. Kirsten and two other shoppers, Brad Frantz and Teresa Ellis, were fatally wounded; Kirsten’s mother was seriously injured but survived.

The attack lasted about six minutes before an off-duty police officer who was dining at the mall engaged the shooter, slowing him until Salt Lake City police arrived. Officers exchanged gunfire with Talović, who was shot and killed at the scene. Investigators concluded Talović acted alone; no arrests were made for the killings themselves. Federal charges were later filed against four people accused of illegally providing the firearms used in the attack.

If anyone was at Trolley Square that evening or has information about Kirsten, her mother, or the events inside the gift shop, authorities may still want to hear from you.