2nd wife was Martha Kelley who he married 25 Jun 1864 in Winston Co, MS
her death date is thought to be 23 June 1875, burial prob in Winston Co, MS
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One of his children was William G. McMinn, who married Mattie D. Robinson in 1890 in Clarke Co MS. Wm G was in Capt Gamblin's Company, 2nd Miss Cavalry, CSA. Mattie later married James Madison Deas from Choctaw Co AL.

Bio information courtesy of contributor #47543543
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The following was posted to Ancestry by TGilbert79

Physical Description of Wm "Billy" McMinn
This description comes from The McMinn Family In America, compiled by Virginia Thompson Brittain and published in 1967. Page 353 (First let me note that on the 1850 Census Williams middle initial appears to be "M". since I haven't found another lace to make this note for now I thought I would include this information with his physical description.)

"William McMinn was approximately 6'2" tall and weighed almost 200 lbs. He had dark red hair, and was of reddish Irish complexion. IN his old age he still wore a short mustache and beard. He had a round face, blue eyes and freckles.
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This information comes from The McMinn Family In America, compiled by Virginia Thompson Brittain and published in 1967. Page 353:

"After his son, "Holly", moved to Texas in 1881/1882, William was left without a home, so his step-son, Brad Kelley, went to Winston County and got him and brought him to Choctaw co to live with him. He died of diarrhea. so when he died, he was buried in the McMinn Family Cemetery in Choctaw Co. instead of being carried back to Winston Co. where both of his wives are buried."