Mario Hortis, 42, was killed at the Equinox Fitness Center in Coral Gables, Florida, on April 8, 2017. Hortis worked as the gym’s fitness manager and had previously trained in Minneapolis; he grew up in St. Cloud, Minnesota, and graduated from Saint John’s University with a degree in economics. Colleagues remembered him as charismatic and thoughtful.

According to reports, the shooter was a recently fired employee who returned to the gym with a handgun and opened fire, killing Hortis and the gym manager, Janine Ackerman, before the attacker died at the scene. The shooting followed a managerial dispute; the shooter had been escorted off the premises earlier that day and had a reported history of workplace violence and prior aggressive incidents.

Anyone with information about Hortis, his work at Equinox, or the events at the gym that day is asked to come forward.