Police were called to the home of the Peterlee killer Michael Atherton four times in two years over domestic violence incidents.
The taxi driver murdered his partner Susan McGoldrick, her sister Alison Turnbull and her niece Tanya Turnbull before turning his shotgun on himself on New Year's Day. Durham Police said the couple, who lived in Horden, had "a volatile relationship". Between 2002 and 2004 police attended four "domestic-related incidents" at the house.