The Independent Police Complaints Commission is to investigate why more was not done to protect a mother and her disabled daughter from abuse.
Fiona Pilkington, 38, committed suicide and unlawfully killed her daughter Francecca Hardwick, 18 after repeatedly asking for help, an inquest jury ruled.
The jury said Leicestershire police and two councils were partly to blame.
The inquest heard the family had endured years of abuse at the hands of neighbours in Barwell, Leicestershire.
The police were called 33 times in seven years as Ms Pilkington and her daughter were subjected to abuse, vandalism and even violence by local youths.