One or both of two FindAGrave memorials - both in West Cemetery - may pertain to Samuel's resting place. Neither indicates year of birth; the second has age at death 81, and interprets hard-to-read year of death as 1832, all of which if correct would not match other data; the second memorial is linked with his wife Rebecca (Osborn) Seymour:
Find A Grave, database and images (https://www.findagrave.com : accessed 23 February 2019), memorial page for Samuel Seymour (unknown–14 Nov 1837), Find A Grave: Memorial #189863338, citing West Cemetery, Litchfield, Litchfield County, Connecticut, USA ; Maintained by J. Fenn-Lawson (contributor 48515955). (no photo)
Find A Grave, database and images (https://www.findagrave.com : accessed 23 February 2019), memorial page for Capt Samuel Seymour (unknown–Nov 1832), Find A Grave: Memorial #64289415, citing West Cemetery, Litchfield, Litchfield County, Connecticut, USA ; Maintained by C Greer (contributor 47180683). (includes photo of gravestone, but it is hard to read)
It may be possible to confirm family relationships with Samuel by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Denny Seymour :
Family Tree DNA Y-DNA Test 111 markers, haplogroup R-BY3298, FTDNA kit #108347 +
Y-Chromosome Test 419 markers, haplogroup R-Y20344