How can I send a thank-you letter to my relatives and friends after my husband's death?

Dear relatives and friends. Thank you very much. Thank you for being with your husband when he was seriously ill. Although my husband didn't overcome his illness in the end, I believe he will thank you for your company all the time. Now he has no chance to say thank you. I think he would want me to speak for him first. Thank you. Please don't feel sorry for him. He wouldn't want this. Thank you!