The citation was taken from Gary Webster’s 1998 work, see below.

http://www.nps.gov/vick/learn/historyculture/confederate-interments-l.htm

Source:
Record Book of Confederate Soldiers,
United Daughters of the Confederacy Case,
Old Courthouse Museum,
Elizabeth C. Taylor, Vicksburg Chapter No. 77, 1958

Compiled as "Confederate Roll of Honor: Known Confederate Dead, Vicksburg Campaign, January 1862-July 1863," by Gary W. Webster (1998)

…….

However, in my copy of Webster’s work, I annotated Lieut. M. C. Leak, Company H. I do not have the source of this correction, nor do I find a record of his death. There is no man by the name Lace in their records. Records of the 17th Louisiana are quite sparse.

M C. Leak
Enlisted on 9/1/1861 as a 1st Lieutenant.
On 9/1/1861 he was commissioned into "H" Co. LA 17th Infantry
(date and method of discharge not given)

Sources used by Historical Data Systems, Inc.:
- Index to Compiled Confederate Military Service Records

……………

M. C. Leak, Private, Company H, 17th Louisiana Infantry, enlisted November 8, 1861 at Camp Moore for 12 months, appointed 1st Lieutenant May 23, 1862, no further records

……………………………..

William A. Maddox's Company (H), Claiborne Invincibles

History of the "Claiborne Invincibles, Company 'H', 17th Louisiana Infantry", by Captain A. L. Harper and Lieutenant J. H. Hay

The company was re-organized on May 21st, 1862, at Edwards, Mississippi, electing as officers, G. M. Kilgore, Captain; M. C. Leake, 1st Lieutenant. . . .

First Lieutenant Leake, who was wounded on May 30th, and died on June 5th, 1863.
http://history-sites.com/cgi-bin/bbs62x/lacwmb/webbbs_config.pl?md=read;id=12565