Oooops!
It appears that Williams brother, J. P. Mooty, also married a Mary E. in 1864.
Mary E Mooty
Birth Jan 1846 in Georgia
Death
Timeline
Birth
1846
Jan
Georgia
1 source citation
Marriage to James Payne Mooty
1864
Age: 18
1 source citation
Residence
1900
Age: 54
La Grange, Troup, Georgia
1 source citation
Ancestry.com