Letty Munroe is the younger sister of Sally Munroe, Lafayette Munroe, Dimity Munroe and Alice Munroe and the older sister of Hugh Munroe. She is friends with India Wilkes and they were both courted by Brent Tarleton, before he turned his attention to Carreen O'Hara.
Her fate during the war is unknown. Her brother Lafayette died in The Battle of Gettysburg.