What is the evidence for him dying in TN?  Seems an unlikely place given that he was still in OH in 1900.

I doubt her deathplace was TN because George was still in OH in the 1900 Census.

1a.  Jordan R. Dodd, ed.  1998.  Marriage Index: Ohio, 1851-1900.  Liahona Research, Orem, UT (Broderbund CD-236):  not found, but there are very few Delaware Co. marriages on the CD.

1b.  Delaware County, Ohio, Marriages.  Vol. 3.  The Records Center, Channing St., Delaware, OH (courtesy of Larry Cellar):

George C. Cellar and Mary Gray, 13 Feb, 1867, by J.P. Howey, MG.

2.  1870 Census Index/Images (online at Genealogy.com, Image #16 of 36):  Constantia P.O., Liberty Twp., Delaware Co., OH, p. 397B, PN 16, 123/119, enumerated 11 Jun 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):¤

Cellar Geo C	33	M	W	Farmer	4050	500	Ohio
______ Mary	28	F	W	House Keeper			"
______ Oliver G	10/12	M	W				"	Aug
______ Rachel F	66	F	W	Without Occ.			Pennsylvania
______ Sarah J	37	F	W	Teacher Com. Sch.			"

Rachel is George's mother; Sarah is George's sister, but Sarah was born in Ohio, not Pennsylvania.

3.  1880 Census Images (online at Ancestry.com; Image #15-16 of 31):  Liberty Twp., Delaware Co., OH, pp. 311A-311B, PN 15-16, SC 5, ED 104, enumerated 14 Jun 1880, official enumeration date 1 Jun 1880 (extracted by Diana Gale Matthiesen):

1800:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).

1

2

3

4

5

6

7

8

9

10

11

13

21

24

25

26

141

143

Cellar George C

W

M

43

/

Farmer

OH

PA

PA

[next page]

Cellar Mary A

W

F

36

Wife

/

Keeping house

PA

PA

PA

______ Oliver G

W

M

10

Son

/

At school

/

OH

OH

OH

______ George B

W

M

2

"

/

OH

OH

PA

______ Humphry

W

M

5/12

Jan

"

/

OH

OH

PA

______ Rachiel F

W

F

75

Mother

/

/

At home

PA

Ire

PA

______ Sarah J

W

F

47

Sister

/

"

OH

PA

PA

4a.  1890 Census:  the 1890 Census Population Schedules were destroyed.

4b.  Veterans' Schedules:  U.S. Selected States, 1890 (Broderbund CD-131):  not found.

5.  1900 Census Index/Microfilm (online at Genealogy.com):  Orange, Delaware Co., OH, p. 220B, SD 7, ED 41, SN 8, enumerated 29 Jun 1900 (extracted by Diana Gale Matthiesen):

1900:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).

1

2

3

4

5

6

7

8

9

13

14

15

19

20

22

23

24

25

27

28

196

200

Cellar George C

Head

W

M

Feb 1837

63

W

OH

PA

PA

Farmer

0

Y

Y

Y

R

F

135

______ Sarah J

Sister

W

F

Feb 1833

67

S

OH

PA

PA

Housekeeper

0

Y

Y

Y

______ George B

Son

W

M

Sept 1877

22

S

OH

OH

PA

Farm Laborer

0

Y

Y

Y

______ Joseph H

Son

W

M

Jan 1880

20

S

OH

OH

PA

Farm Laborer

0

Y

Y

Y

______ Nelson F

Son

W

M

May 1881

19

S

OH

OH

PA

Farm Laborer

6

Y

Y

Y

6.  Delaware County Historical Society - Delaware County Genealogical Society.  Master Index for Burials in Delaware County, Ohio (online at the Delaware County OHGenWeb site):

Last Name	First Name	Death Date	Cemetery	Funeral Home or Info Source
Cellar	George C.		LIBERTY CHURCH CEM.
Cellar	Mary		LIBERTY CHURCH CEM.

Might this be our couple?

7.  Jenora McKinzie Stilwell.  The American Civil War:  Roster of the 96th Ohio Volunteer Infantry. [link died]  Citing "(1) Volume 7, The Official Roster of Soldiers of the State of Ohio in the War of the Rebellion, and (2) The Roster of the Ninety-sixth Volunteer Infantry, 1862-1865 compiled by Robert F. Bartlett, Souvenir Edition (1895)."

The 96th O.V.I. was recruited in July and August, 1862, in the counties of Delaware, Knox, Logan, Marion, Morrow, and Union and was organized at Camp Delaware, located just south of the town of Delaware, Delaware County, Ohio.
Celler	George C	Pvt	96th OVI Co F	07/07/1865
Cellar	George C	Corp	96th OVI Co A & Co C	07/07/1865

8.  Anon.  1880.  History of Delaware County and Ohio.  O.L. Baskin, Chicago (online at Heritage Pursuit):

p. 656

GEORGE C. CELLAR, farmer; P.O. Powell; enlisted in Co. F, 96th O.V.I., July 26, 1862, and was out three years and four days; during this time participated in the battles of Arkansas Post, Chickasaw Bluffs, Vicksburg, Grand Chateau, and those of the Red River campaign Forts Gaines, Morgan and Spanish Fort; during the battle at Arkansas Post, he received a wound in the leg, which disabled him from duty four months; he was a soldier who was always at his post and ready for duty when detailed; was mustered out at the close of the war, at Mobile and received an honorable discharge at Camp Chase; upon his return, he resumed farming and was married, Feb. 13, 1867, to Mary Gray, a native of this State; she died Nov. 18, 1874, leaving one child -- Oliver, born Aug. 8, 1869.  Mr. Cellar married a second time Mary A. Bard, native of Pennsylvania; this took place in November, 1876; they have one child -- Bard, born Sept. 16, 1877.  Mr. Cellar was born in this

p. 657

township Feb. 21, 1837, and is a son of George and Rachel (Fleming) Cellar, who were married Dec. 7, 1826.

9.  LDS.  Family Search: Internet Genealogy Service:  AF - Ancestral File (online at FamilySearch.org).