Letters of condolence are difficult for most of the people. Be brief and tactful and don't say she/he was too yioung to die or life will be desolate without him. A letter of condolence has only one purpose to give comfort tactfully and sincerely.
Helping sentences of CondolenceSankit and I were deeply saddened to hear of Karvi's passing. He/She was a devoted husband/wife to you and a dear friend to all of us.
We will cherish his/her memory. We know your sorrow are very great at this time, and our thoughts and prayers are with you. When the time is right, please call us. We would like to spend time with you.
SincerelyI was so sorry to learn of your mother's /father's passing. She/He was a warm and gracious lady/man who will be missed not just by your family but by all who knew her/ him.
Please extend my condolence to your entire family.
With my deeper sympathy