As the six FedEx workers who were shot Tuesday at a Georgia facility continue to recover, there are still no answers for why 19-year-old Geddy Kramer, the alleged shooter, brought a shotgun to work and opened fire on his fellow employees.

News reports say the most seriously injured, 28-year-old Christopher Sparkman, is expected to make a full recovery after a series of surgeries. Sparkman, a security guard at the FedEx facility, was Kramer’s first victim - shot in the stomach at close range. Two other victims remain hospitalized; three were treated and released.

Kramer, a FedEx baggage handler,  was found dead of a self-inflicted wound inside a trailer at the facility.

Police sources say Kramer left a note but did not reveal its contents and declined to speculate on a motive.

CBS Atlanta reported that Kramer may have suffered from depression and had previously suggested he might bring guns to his job. “I remember Geddy would always joke around about shooting up his workplace,” family friend and next door neighbor Lucas Dziedzic told Channel 46.