Category:Mass murderer duos

After this discussion, it was decided that this category should have some action that requires manual changes.
Once the manual work is completed, this category may be deleted, if that was the consensus of the discussion.

The following lists individuals who have committed mass murder, defined as killing at least four people at the same time or over a relatively short period of time.

This category is not to be used for those who were in charge of mass murder but did not personally commit the crime (e.g. politicians, military officers, warlords).

For people who have committed multiple separate murders over a period of time see Category:Serial killers.