Some New York Counties Have Death Dates in Their Probate Records Indexes
This is probably not news to expert New York genealogists, but it was to me as a non-expert.
I went looking for Ann (Donelson) Seaver in the St. Lawrence County, New York probate records on FamilySearch, thinking perhaps she went to live with her sister in that county after 1860.
On the FamilySearch record collection for New York Probate Records, 1629-1971, which is not indexed, I found St. Lawrence County easily, and their probate records had an index for Administrations and another index for Wills. I searched for Seaver by guessing image numbers and quickly found the pages for Se and noted that there were a number of Seaver and Sever entries in both set of indexes.