What was Matthew Farwell's personal situation at the time of Sandra Birchmore's death?

At the time of Sandra Birchmore's death, Matthew Farwell was married with his wife pregnant with their third child. The timing of events is particularly disturbing, as just hours after Farwell allegedly murdered Birchmore, his wife gave birth. This detail adds another layer of complexity to the case, highlighting the double life Farwell was leading - allegedly engaged in a relationship with Birchmore, who was also pregnant, while simultaneously maintaining his family life at home with his wife and children.