What happened to Dr William M May?

What happened to Dr William M May?Born April 9, 1826.He wasat med school in the early 1850's at New Orleans.From Monticello, Lawrence Co. and Walthall Co. Mississippi.First married with Marion Elizabeth Wilson 1853, one daughter Florence Medora May (m. John Richmon Collins 1872), b. 1854. Elizabeth passes in the yellow fever epidemic at New Orleans in 1855.Believed married 2nd Margaret Badon, one daughter, Flora (m. a Rials).William was in the Pike Co MS 1850 census with brother Obediah.

Can no find in 1860,1870 census, need help to find where he died and where he may be buried?Any help would be appreciated!