Detective Chief Inspector Rob Griffin, from the East Midlands Major Crime Unit, has told ITV News Central Susan and Christopher Edwards displayed a heartless attitude from the moment they were arrested.
More top news
West Midlands Weather: Windy on Sunday with showers and sunny spells
East Midlands Weather: Heavy rain over Derbyshire hills, drier and brighter elsewhere
The city’s spike in coronavirus cases has sparked a report that it may be the first UK location to be subjected to a district lockdown.