The family of murdered Leeton school teacher Stephanie Scott is suing the New South Wales government.

The NSW Department of Education was not made aware of the claims filed in the state’s District Court before proceedings commenced this week.

“The department is aware the circumstances resulting in these proceedings are sensitive and all efforts will be made to respond to the claims appropriately,” a department spokesman said in a statement.

Drama teacher and bride-to-be Stephanie Scott was raped and killed at Leeton High School in the Riverina by Vincent Stanford, a cleaner at the school, on Easter Sunday in 2015.

Mr Stanford attacked Ms Scott who had gone to the school to prepare lessons for a relief teacher who planned to fill in for her while she was on her two-week honeymoon.

Mr Stanford, who obtained a “rape kit” from his home, was arrested four days after the horrific attack.

The then-24-year-old admitted in a police interview he went “a little nuts” after he dragged the young teacher into a storeroom where he sexually assaulted her and stabbed her in the neck with a large knife.

The killer later drove Ms Scott’s car to the Cocoparra National Park, some 70 kilometres away from the Leeton school, where he poured petrol over her naked body and set her alight.

He was sentenced to life in prison without parole in October 2016 for murder and 15 years in jail for aggravated assault.

Mr Stanford’s legal aid lawyers appealed the life sentence in November.

The murder’s identical twin brother, Marcus, was also charged over his involvement in Ms Scott’s death after being extradited to NSW from his home at Forreston, South Australia.

The brother exchanged numerous SMS messages and Mr Stanford sent Ms Scott’s rings and driver’s licence to his brother, which were later sold at an Adelaide jewellery store for $705.

In March 2016, he pleaded guilty to being an accessory after the fact to murder and was jailed for at least 15 months for helping his brother after the crime.

 – with AAP