When she called the relationship off he refused to accept it and began bombarding her with messages which left her feeling “scared and terrified”.
On October 12 2016 he broke into her home and slashed her throat as she was taking a shower.
Dhillon was jailed for life in April last year and told he would have to serve at least 22-years in prison.
Alice’s mother, Dr Sue Hills, said she was satisfied with the IOPC conclusions, saying mistakes made by individual officers were as a result of a broader misunderstanding of stalking by police, across both the force and the country.
In a statement, the family said: “Sadly, police response to stalking has been shown to be inadequate in almost every area of the country and Alice’s experience is not unique. It is vital that police and all areas of society take notice of this report
Northumbria Police said “lessons have been learned” on stalking following the case, with training developed with Alice’s family now shared across the country.
Assistant Chief Constable Rachel Bacon said: “Their support and input has been vital in developing training that is now being used by other police forces and partners and for that I can’t thank them enough.”