How to write a obituary for an American?

You want to state the facts -when the person was born, what he did, i.e., graduated such as such college or university and what year, who he worked for, position,, family - wife, kids, grandchildren, special pets, etc. Then end with information on any memorial service/church service - or, since it's a client of your company - that he or she will be missed by all.

I think you just have to say whay you feel about this person, state your relationship perhaps and let the family know that you are sorry for theit loss....