@Christian_Reich, I was misled by the death_type_concept_id field which I assumed to be a characteristic of death fact and treated as a single record per person. But, thanks for your clarification, the type concept is, in fact, represents a source of death cause, so clearly it goes into the cause of death table because it has 1:1 relation with cause. Now the picture is clear for me and causes no more confusion. The only negative consequence is that we lose the link between the death date and the cause which the date was based on.