Dear Len, 
We are so deeply saddened by your loss.  Please accept our sincerest sympathies as we mourn both the loss and the physical struggle Natasa endured during her illness. Natasa's spirit lives on in your memories and the many happy moments you shared in your marriage.
Your friends at the State Department Arms Control, Verification, and Compliance Bureau are keeping you in our thoughts during this difficult time. We’ve made a donation in Natasa’s memory to the American Cancer Society for $350.  This was done with contributions from your colleagues across the Bureau and Front Office, to include individuals from ESA, VTT, NRRC, and MNA.  While we realize this will not diminish your grief, we hope it provides some comfort to know we are thinking of you and Natasa often.  It is our hope that this donation will help so that one day others won’t have to endure similar circumstances. 
We are all here for you if you need anything.  Please don’t hesitate to reach out.
Warmest Regards,
Your friends at the State Department