An inquest jury has recorded a verdict that a woman who died in a house fire in Northampton was unlawfully killed.
Mavis Clift, who was 75, died in a fire at her home started by her daughter's estranged husband on New Years Day in 2008.
Paul Barber, who had been charged with the murder, died in prison the following year from natural causes while on remand in connection with the killing.
The inquest heard police officers had been alerted more than 20 times to a campaign of intimidation and harassment against Mrs Clift. The coroner said there had been systematic failures by the police.