Ran into what I found to be a fairly short description of dealing with death and loss on WSJ that seems very worth of consideration for those of us forced to deal with this topic -- which is ALL of us until we exit this mortal coil.
Every person and every loss is unique. Some may want to have some sort of "closure" (no matter what the article says) ... possibly for "always", or they may change their mind on the topic in the same night ... both directions. Emotion, grief, loss, death -- these are not topics that lend themselves to pat answers or "one size fits all" templates for how they "should" proceed.
Be there for those that have lost that are grieving and try to support them in what they are going through as best you can understand what they need -- and pray that there will be someone that does the same when it happens to you!
NEVER make statements like "You OUGHT to ..." Ought, should, so and so did, etc relative to someone dealing with loss are minefields. Just avoid walking into them.
OTOH, when it is you that is in grief, TRY to forgive those that are trying to help even if they are doing it horribly. Even perfect support can at times fail miserably because ... well, because things like logic, rules, guidelines, reason, common sense, etc really don't count for much when facing the permanent (for this life) loss of part of one's very soul.
I liked the following paragraph even though I think it as well can be wrong in some cases. The article is worth the short read.
The reality is that closure is a myth. My personal and professional experience with those who have lost friends and family, including children, has taught me that going on with life is not the same as gaining closure. The wound of loss is a part of each person’s life forever. We continue to think about those dear to us, though perhaps not every day or with the same intensity. Recollection is sometimes provoked by a date on the calendar or, less predictably, by a sight, sound, aroma, melody or place that evokes the missing person.