Dear Mr. /Ms. / Mrs. (recipient’s name),
I am in really shocked state to know about the (state the reason of writing this sympathy letter). When I met your (relative’s name of recipient) couple of days ago in our college, she was fit and fine. I am very sorry for the (give the specific loss) of him/ her as I can comprehend the depth of your sorrow and troubles. I offer my sympathy for the bad health of your (relative’s name).
I am sure everything will be fine soon again. You need to be strong to face these situations as your parents are staying far from you. I will pray to God for his/ her (speedy recovery or good health).
Please feel free to contact me at my (mention your phone number along with other contact details like email id) if you need any kind of help. I am always there with you.
Once again my sympathy is with you.