Todd and Lisa Sturgeon knew their son was dealing with mental health issues. Lisa Sturgeon said she and her husband did not see any signs of violence before their son, an employee at Old National Bank on East Main Street, walked into his workplace and started firing bullets from an AR-15-style rifle, killing five people and injuring eight others. ’ But Connor in his darkest hour needed us to be exceptional, not reasonable — and we failed him,” Todd Sturgeon said