Sorry to hear about your friend.
It really depends on how close you are to the guy. If he's a colleague/acquaintance then keep if fairly formal and respectful. If you are much closer then obviously you'll want the letter to be more personal. In either case, I would try to keep it quite upbeat and not too morbid.
It really depends on how close you are to the guy. If he's a colleague/acquaintance then keep if fairly formal and respectful. If you are much closer then obviously you'll want the letter to be more personal. In either case, I would try to keep it quite upbeat and not too morbid.