A security guard who was shot during a rampage at a FedEx facility just outside Atlanta is suing the company.

A lawsuit filed Monday in Gwinnett County Superior Court by 29-year-old Christopher Sparkman accuses FedEx of negligence and gross negligence.

Police have said 19-year-old Geddy Kramer shot Sparkman at the start of an April 29, 2014, attack at a FedEx facility in Kennesaw near Atlanta. Kramer wounded six people, including Sparkman, before killing himself.

The complaint accuses FedEx officials of knowing Kramer was mentally unstable before the shooting but failing to intervene. The suit seeks lost wages, medical expenses, compensation for pain and suffering and more.

FedEx spokesman Perry Colossimo said in a written statement that the company isn't responsible for the shooting and hasn't been served with the complaint.