You are talking about the ledger listing payments, entitled "U.S. Pensioners, 1818-1872" on Ancestry.com. This is not on HeritageQuest.
In the first instance, that would be city of Albany.
In the second instance for the Utica pension office, you will note many entries where the payments just end, with no notation as to reason why. It all depended on how much information the clerk had in front of him, and possibly how much he felt like entering everything in front of him, or whether someone was breathing down his neck so he just wrote in the essentials (according to his instructions, not so much according to what we'd want to know now).
There are reasons other than death why payments might end. One of my ancestors was struck off the pension roll when a son-in-law wrote the pension office saying that he had deserted and did not deserve the pension. Later his 3rd wife applied for a widow's pension successfully, showing evidence that he had returned to the regiment.