Dear Mrs. Morcom,
I want to say how sorry I am about Chris. During the last year, I worked with him continually, and I am sure I could not have found anywhere another companion so brilliant, and yet so charming and non conceited. I regarded my interest in my work and in such things as astronomy to which he introduced me as something to be shared with him and I think he felt a little the same about me. Although that interest is partly gone, I know I must put as much energy, if not as much interest, into my work as if he were alive, because that is what he would like me to do.
I feel sure that you could not have possibly had a greater loss. Yours sincerely,
Alan Turing