The pension index card (9) refers to "Henry L Parker C 4 + C 20 Pa Inf H 6 Pa Cav". Did McKee enlist in those regiments under a pseudonym?
He was 22 years old when he was enrolled (6, 7 [24 in 1863]).
He was a farmer (6, 7). He was living in Philadelphia, Pennsylvania, when he was enrolled (6).
He was 5 feet 6-1/2 inches tall, and had a dark complexion, gray eyes, and red hair (6, 7).
He was enlisted and mustered into service as a private on 29 November 1861, at Philadelphia, Pennsylvania (1, 5, 6 [27 Nov]). He was enlisted for three years, at Philadelphia, Pennsylvania, by Captain Bowman (5). He served as a private in company B (1).
On 23 February 1863, he returned to the regiment from duty at Windmill Point Hospital (4).
On 1 June 1863, he was transferred from being detailed as a teamster, to being in the Artillery Brigade as a teamster (3).
He fought at the Battle of Gettysburg (11).
He reenlisted as a veteran volunteer on 26 December 1863, at Bealton, Virginia (1, 6, 7 [25 Dec], 9). He was enlisted for three years by Lieutenant Carpenter, and mustered by Lieutenant Swan (6).
He was wounded on 18 June 1864 at Petersburg, Virginia (1, 6, 7). He died on 19 June 1864 of those wounds (1, 6, 7, 8, 9).
He was buried at the City Point National Cemetery, Virginia, section E row 2 grave 120 (1; 2 has section C). He was originally buried on Prince George Road, half a mile east of Meade Station (10).
On 9 July 1864, Barbara McKee, his widow, successfully applied for a pension (9, 10).
1 Bates, Samuel Penniman. History of Pennsylvania volunteers, 1861-5. Harrisburg: B. Singerly, state printer, 1869-71. 5 volumes. 'Ninety-first regiment', volume 3, pages 186-233. (In the roster)
2 City Point National Cemetery, interment index (searched 5 Oct 2000)
3 order, Sinex, 6 June 1863
4 consolidated morning report, 91st PA, 23 Feb 63 (Private McKee)
5 company B, descriptive roll, entry 32 (William McKee)
6 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 31 May 2004 (William McKee)
7 company B, [second] descriptive book, entry 20 (William McKee)
8 consolidated morning report, 91st Pennsylvania, 29 June 1864 (Wm McKee)
9 pension index, by regiment (William J McKee)
10 pension index, by name (William J McKee)
11 Pennsylvania Memorial, Gettysburg, Pennsylvania (William McKee)
10 'Our illustrious dead', Philadelphia Inquirer 20 July 1865 page 2 (William McKee)
[I did not find an entry for him in the index on <www.ancestry.com> to the 1890 veteran's census (searched May 2007)--I didn't read all the entries, but looked for entries with a widow]