This regiment had not been in any combat by June 1862. If your man was "killed" then it must have been in an accident or personal quarrel, etc. Disease, however, was a primary cause of death for men in the early days of a regiment's organization.

From the archives of this message board:

Jane Johansson 4 January 2007, : 11 Texas Infantry (Betty Cravy)
I am not an expert on the 11th Texas Infantry, but in 1998 I did write a history of the 28th Texas Cavalry (dismounted) that served for much of the war in the same brigade as the 11th Texas.
As far as I know no one has written a full-length history of the 11th Texas. The Texas State Archives does have the "11th Texas Infantry Description Books" in its collection. I recall there is a listing of officers in these ledger books--I believe it even lists ages and birthplaces for the officers. The books contain a number of strength reports--telling how many men were present, absent, in arrest, detailed, etc. for specific dates. There are also some inspection reports in the books. If you have a serious interest in looking at the descriptive books, then I would suggest that you contact the Texas State Archives and find out in more detail what information is in the books The Confederate Research Center does have a file on the 11th Texas that might have some items of interest. . A number of Texas newspapers are available on microfilm and could probably be obtained on interlibrary loan. The Center for American History at the University of Texas in Austin has an excellent collection of Texas newspapers on microfilm. Good luck on your research!
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From Compiled service records for Capt Engledow

Co C formerly Co A
Co letters changed as result of the reorganization on 6/23/62
Engledow-Capt---to LtCol
Appears present on regimental return for month ending 6/30/62 Camp Clough [near Tyler, Texas] -elected and assumed command 6/23/62

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From my own personal use notes:

5/24/62 Camp Lubbock [near Houston]-ltr from Col Roberts to S Boyer Davis ref condition of his command, both the regt and the Bn, [Hubbard's] and asking for supplies-
690 absent on detailed service & furloughs

5/15 I rec’d order to move my command to Tyler-this order resulted in the men furloughed stated above
240 sick in camp & hospitals
408 fit for duty in camps—as result of 5/18 rec’d order to retain all the men I have fit for duty at camp
1338 off & men
Very few knapsacks & haversacks

Those across the Trinity on furlough are expected to report to Tyler by 6/15
Recruits for the regt & Bn will report at Tyler by 6/5
Total recruits & furloughed men=1800

5/27 Camp Lubbock-Roberts to Capt S B Davis-Pursuant to the order of 5/26 by the cdg Gen of the Dept to move my regt to the rendezvous at Tyler, the remaining part of my regt will be moved to Navasota en route for Tyler on tomorrow. There, wagons are being hired- asks to be relieved from furnishing a guard for the magazine

5/30-regt marched via Navasota, Anderson, Crockett and Rush from camp Lubbock to Tyler

6/7 along with 6th Tx Cav, left for Arkansas but were stopped in Tyler, Tx by Gen McCulloch for added training and to allow any stragglers to rejoin the unit.

6/20 arrived Tyler, Texas-distance from Houston 220 miles
Roberts to McCulloch’s AG-says he established this camp 6/20 at which time the furloughed men and recruits had joined the regt mostly

6/23-reorganized resulting in election of Roberts

TYLER REPORTER, 6/26-The re-organization of Col O. M. Robert's Regt took place last Mon, but we have no announcement of the result. We learn, however, Col Roberts was re-elected without opposition.—James Jones, Lt. Col, and ______Carroway, major.

[MARSHALL] TX REPUBLICAN, 7/5, p. 1
[Summary: Reorganized Roberts Regt in Tyler on the 23rd: O. M. Roberts Col, Jas H. Jones lt col, N. J. Carraway major. Staff: Bird Holland—Adjutant, W. M. Rose, Quartermaster; Martin Casy—sgt. Major, ______ Jones Surgeon]

6/26 Tyler-Robertson vol ADC to Gen McCulloch gets invitation to dine w Judge, now Col Roberts

6/27 asst surgeon assgd to duty [with the regiment] by Gen McCulloch

7/5 Camp Clough near Tyler-Roberts to Capt S B Davis AAG-says he established this camp 6/20. The regt was reorganized 6/23 & the returns of the election sent to Gen McCulloch at his hqs in Tyler. After reorganization, the returns of 6/30 show the regt with 949 officers & men & increasing daily. I have obtained 126 guns from those discharged at reorganization & 106 more turned over by Col Garland [6th Tx] We are hurriedly preparing our transportation. Tents, knapsacks and wagon sheets should be finished in 10 days.
Gen McCulloch is working hard to forward the regts here northward, but we need funds to obtain the transportation.