He was buried in Canton, Connecticut. Born in 1816, and married when he died. I also found him in the 1850 Census, but I haven't found his parents yet.
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M68K-NX9 : 12 April 2016), Alonzo Warner, Canaan, Litchfield, Connecticut, United States; citing family 795, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"Connecticut Deaths and Burials, 1772-1934," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F726-24F : 9 February 2018), Alonzo Warner, 09 Nov 1886; citing Albany, New York, reference p 15; FHL microfilm 3,326.