An evening of shopping at Foothills Mall in Fort Collins, Colorado, turned deadly on April 5, 2025, when gunfire on a sidewalk between the parking lot and a mall building left 27-year-old Luis Angel Arreguin dead. Arreguin, from Westminster, was taken to a local hospital and later died of multiple gunshot wounds; the Larimer County Coroner’s Office ruled his death a homicide. His older brother, 37-year-old Ivan Arreguin Grimaldo of Greeley, was also killed in the same incident.

Fort Collins police briefly locked down the mall and movie theater while securing the scene. A juvenile was taken into custody the next day; authorities later announced 16-year-old Bryan Gallego would be charged as an adult with two counts of first-degree murder, attempted first-degree murder, unlawfully carrying a concealed weapon, and possession of a handgun by a juvenile. Prosecutors and investigators have suggested the shooting may have been gang-associated, and Gallego is being held on a $2 million cash bond.

The victims’ sister, Cassandra Grimaldo, said the siblings had moved to Colorado together years earlier and that she was their only sister; she learned of the deaths via social media and described deep heartbreak. Does anyone have information about the events at Foothills Mall that evening or knew the brothers?