Depends a bit when and where the death may have taken place - do you know the ages of the people who died, for example. If not, three or so of them will probably be infants, which will rule them out straightaway and the local register office will probably tell you that. It may also be worth checking for a death notice in the newspaper or a burial or a will - difficult to advise without knowing a few more details.
The death may not have been registered by his widow, it could have been registered by a grown up son or daughter or even an in-law. If he died in an institution - hospital, workhouse, prison, asylum etc - it would have been registered by an official of the institution.