Am I guilty that my grandad died?

I got tired from feeling guilty but however I need a discussion. My grandad died recently at the age of 85. We started caregiving in January, before he had another carrgiver. He had been living alone for 2 years his exwife look after him. She said he had stopped eating properly since automn. He looked fine and we visited him every other day. He said he didnt need visiting every day, we washed him and did housework. As for the pills, he got phycosis due to them so ambulance suggested deprisctibing.We fed him and left food. We didnt let him out, as we were scared hd would get lost. So we fed him and left food. He was walking and he didnt want to go to elderly house. He was eating but close to march he stsrted eating a lot less. He didnt eat the food we left, with us only a little. In april he died he stopped eating comletely. I want to discuss my guilt. We started visiting everyday but he stopped eating completely. In march he spit out food as well.