Murderers are known to leak sadness. Your new joint venture partner might shake your hand, celebrate, go out to dinner with you and then leak an expression of anger.
Or, as the Journal would prefer to phrase it less elegantly, is anything to be gained by finding out who committed a murder when the murderee is already dead?
The assassination of President Lincoln fell on the party while they were at Rome, where it seemed singularly fitting to that nursery of murderers and murdered, as though America were also getting educated.