Killer couples are of great concern. It is believed between 10-25% of all murders are couples.
Hand in glove with the presentation given on 24th November 2021 are two excellent documents that help to explain this genre of this type of true crime..
The first in the Appeal Judgement made by Sir Brian Leveson in respect of Edwards and Markham. The backgrounds of the killers are very telling
Secondly, there is a very good article about the Lonely Hearts Killers