Maybe we found him...
L. A. Langford
20th Texas Infantry (Elmore's)
Company E
Soldier's Rank_In Private
Soldier's Rank_Out Private
Alternate Name L. U./Langford
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20th Regiment, Texas Infantry (Elmore's)
20th Infantry Regiment was organized at Galveston, Texas, during the early summer of 1862 with a high percentage of middle-aged men. They were from Hempstead, Houston, Austin, Kaufman, Galveston, and Huntsville, and Walker County. The regiment was assigned to the Trans-Mississippi Department and served in Texas. It performed guard duty along the coast from Galveston to the Sabine River and in April, 1864, reported 21 officers and 622 men present for duty. On June 2, 1865, it was included in the surrender. Its commanders were Colonel Henry M. Elmore, Lieutenant Colonel Leonard A. Abercrombie, and Major Robert E. Bell.
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This puts an "L. Langford" in Confederate service at the time and place your ancestor may have died. I looked for a Texas Pension application in either his or his wife's name but found none. I also looked at the Louisiana pension list but found nothing there either.
Your best hope at this point is to order his compiled service record. Hopefully that will tell you where and when he died, if indeed he was the man I named here. May I suggest contacting our own Alan Pitts about obtaining these records? Here is the link. Tell Alan we sent ya!...