Have you talked with Steve Hardwick? He is the owner of the website of the 26th Miss @ www.26thmississippi.com he may have more info on Stephen.
My GGG-Grandfather was also in the 26th Mississippi Company C as a private under Stephen. I have no more info I can add about Stephen, but would email me ( mp3family@hotmail.com )about the matter in which he was "Assassinated"? I don't live far from Fulton, which Cemetery is he buried? Can I be of any help, living close to Fulton? Have you all ready contacted the proper people for the marker?
Thanks,
James Nichols