When did Mary Ann Green die?

The quick answer is "probably by 1880, maybe even by 1871 or 1872."

In fact, the 1870 Census is the last time we see evidence of Mary Ann.

In the 1870 US Census for AL, Mary is 49 and living with husband Jno in Brierfield, Bibb County. He is 60, works in a wagon shop, born So. Carolina, a male citizen of the US. In the household are daughters Ellen, 15, Susan, 13, and Antoinette, 12. Also son Abram, 19, who works on a farm. Neighbors are Williams, Garrett, Charles Rea, Oakley, Barnes, Quillans, and a few doors away, Mike & Britta Flynn.

Consider these facts:

1. On April 4, 1872 J. P. McKinney married Mrs. L. F. Morgan in Bibb County at the home of Mr. or Mrs. Quillan. Bondsman was A. E. (Abraham Early) McKinney, performed by James W. Wood; J. Gardner, Judge of Probate. While it’s possible that Mary Ann and John, Sr.'s son, John, Jr., married Mrs. Morgan, it’s likely that it really was the father. They all moved to Leflore County, MS, by 1876, when A.E. married Savannah Davis. (Marriage licenses at Ancestry.com and FamilySearch.org)

2. In 1879 John Quillan married Mahalia (Antoinette/Armetta J.) McKinney in Leflore County (Ancestry.com). Note that John P. married Mrs. Morgan at the home of the Quillans in 1872.

3. Mary Ann is not in the household in 1880. In fact, the head of household (John's) status is listed as "widowed."

In the 1880 US Census for MS, K.P. McKinney is 71, born SC, in LeFlore County, Beat 3, District 135, widowed. Parents born SC. In the household are daughter J or I Quinnon and son-in-law John Quinnon. Both born AL. Sarah Ellen and husband J. Pinkney Lemly are on the page after them in LeFlore County. Daughter J. is born AL, parents born SC, John Quinnon is born AL, parents born AL. Quillan-Quillan-Quinnon. Coincidence? I think not.

4. J. C. McKinney is listed in the Third District of Leflore County in the 1880 Returns for MS State Census at FamilySearch.org. He is 70. born SC, farmer.

(FYI: By 1880 Lucinda Morgan McKinney was divorced from JP and living in LeFlore County, MS, with her son George Morgan. But I digress.)

So a good theory, supported by plenty of proof, is that Mary Ann died between 1870 and 1872 in Bibb County. I haven't found her gravesite or death certificate. But I will. If it's there to find in Bibb County. I'll find it next trip.

RIP, Mary Ann Green McKinney.