Scott - for what it's worth
Mark Hughes in Confederate Cemeteries, Vol 1 says, page 32, "Atleast three Confederate soldiers are buried in Covington's Cedar Hill Cemetery. One of these soldiers drowned, while another died of measles.
Marmaduke, nfn - Fitz Lee's Cavalry - drowned at Holloway's Ford - 12/31/1863 - buried Covington's Cedar Hill Cemetery
Turner, Bruce - died of measles in 1861 - buried Covington's Cedar Hill Cemetery
Center, Archer - 24th North Carolina - buried Covington's Cedar Hill Cemetery
From checking the NPS CW-S&SS, it will probably be one of the Marmadukes who served in the 9th Regiment, Virginia Cavalry [Johnson's] as they were a part of Fitzhugh Lee's cavalry - which could be either Luther R. Marmaduke or William C. Marmaduke. A check of the records should show which one.
There are 13 B. Turner's listed but no Bruce Turner. I am going to hazzard a guess and say it "might" be Beverly B. Turner, aka Bradshaw B. Turner, Pvt, Co H, 9th Regiment, Virginia Cavalry [Johnson's]. It seems to fit if the Marmaduke was in the 9th also - sort of backing each other up. Again, if this is him, his records should show it.
As for Archie or Archer Centre or Center [ note that it is also found spelled Senter or Sentre ] the only one I can find in the NPS CWS&SS is
A. Center, Pvt, Co H, 22nd South Carolina Infantry
I don;t know if this is him or not.