Dear {recipient},
We here at {company name} were truly sorry to hear of the loss of {deceased}. Please allow me, on behalf of all of us at {company name}, to extend my deepest sympathies to you and your family as you struggle through this period of shock and grief.
Your {husband, wife, mother, father, sister, brother, etc.} was a valuable asset to this company, and we mourn the loss along with you.
I know you will find support in your family, your friends, and in those of us at {company name}. We are here to help in any way we can, and {name of appropriate person} will be contacting you shortly to see what we can do to make this just a little bit easier on you, if that's at all possible.
Please don't hesitate to contact me or anyone else at {company name} should you think of anything we can do to help.
Sincerely,
{Sender}
{Company name}