When a long illness precedes a death, use this condolence letter to express your sympathies.
Dear {Recipient},
I was so sorry to hear about {deceased}'s passing. I know that {he/she} was suffering, but it is difficult to fathom the loss of such a caring, generous person. {He/she} is in my thoughts often, and I hope that {he/she} is finally at peace.
You are also in my thoughts during this time off loss. I am so sorry for your pain. I know that {deceased} was always so kind and patient concerning {his/her} illness, and also extremely grateful for the support and care you provided. If there is anything I can do for you, please don't hesitate to ask.
Love,
{Sender}