Family submitted a case last year accusing police, social services and courts of ‘serious failings’ but had no response

The family of a woman killed by an ex-partner who bombarded her with hundreds of messages and calls will ask a judge on Monday to force the French authorities to explain why they failed to protect her.

Sandra Pla had complained to police three times about Mickaël Falou’s threatening behaviour over a period of six months, but her application for a protection order was rejected.

After she sent a desperate plea for help to the public prosecutor in which she wrote “I fear the worst,” Falou was finally summoned by police and told he was being put under investigation.

Less than 36 hours after he was released and ordered not to approach Pla, Falou hid for more than four hours in a shed outside her apartment and attacked her as she returned from dropping their daughter at school, stabbing her 50 times.