A Chinese businessman, motivated by revenge, brutally knifed a family of four on the same day as the rest of the country celebrated the royal wedding, a court has heard.
Anxiang Du, 54, denies killing Manchester Metropolitan University lecturer Jifeng "Jeff"' Ding, his wife, Ge "Helen" Chui, and their two daughters, Xing "Nancy" 18, and Alice, 12, on April 29, 2011.
William Harbage QC, prosecuting said Du had planned the killings and "carried it out with ruthless efficiency."
Jurors were told that the killings could be timed accurately because a 999 call had been made from Alice's mobile phone at 3.32pm.
The call was sent via BT, whose operator could hear the sound of female screams, more than one scream"
A Judge has described how Anxiang Du was a "man on a mission" on the day he killed a Northamptonshire family.
Today the man who repeatedly stabbed a family of four was found guilty of murder in what was described in court as a cold-blooded massacre.
A killer who massacred a family of four was able to flee the country after police mishandled a 999 call from one of the victims.