First Security (FSGI) 8-K Departure of Directors or Certain Officers

ROBERT P. KELLER

c/o TRIUMPH INVESTMENT MANAGERS LLC

116 B SOUTH RIVER ROAD

BEDFORD, NH 03110

May 13, 2013

Mr. Larry Mauldin, Chairman

First Security Group, Inc.

531 Broad Street

Chattanooga, TN 37402

Dear Mr. Mauldin:

Please accept this letter as my notice of resignation from the Boards of Directors of First Security Group, Inc. and FSG Bank effective immediately.

I do wish you and the Boards success as you undertake the many tasks which lie ahead.

Sincerely,

/s/ Robert P. Keller

Robert P. Keller