Kirby found the reason a number of family tree references have YA dead in 1863, which I am sure is wrong! Fake news I presume :>)

https://www.newspapers.com/clip/106213853/

Purcell Dead. Young A. Purcell, late a celebrated guerrilla, we are informed died in Callaway County, recently, from cramp cholic.
Clipping location on Daily Missouri Republican page 2
CLIPPED FROM
Daily Missouri Republican
St. Louis, Missouri
02 Nov 1863, Mon • Page 2

Another tidbit you likely know about but while double checking newspapers it popped up.

PURCELL AT WORK. We learn that Assistant Provost Marshall Stauber was captured yesterday between Fulton and Mexico, in the stage, by some of Purcell's guerrillas. The rebels stole the horses out of the stage, and took possession of the mail. The band is being pursued with some prospect of their being overtaken.
Clipping location on Daily Missouri Republican page 2
CLIPPED FROM
Daily Missouri Republican
St. Louis, Missouri
11 Jun 1863, Thu • Page 2

Of course we know Purcell was surrendered and paroled in 1865 at end of war.