Killed in Afganistan in 1841 in the First Anglo-Afghan War. He died unmarried.
Sources
Baptismal record Edinburgh, Midlothian (13 September 1801 James Dundas Douglas son of Howard, Baronet Douglas and Ann)
Johnston, George Harvey. "The Douglases of Morton." The Heraldry of the Douglases: With Notes on All the Males of the Family, Descriptions of the Arms, Plates and Pedigrees. Edinburgh: W. & A.K. Johnston, Limited, 1907.82. Print.