The family of a young Derry mother shot dead in April 1981 has offered a reward for information leading to the conviction of those responsible.

Joanne Mathers was killed by the IRA in the Gobnascale area of the city as she collected census forms 31 years ago.

Her husband, Lowry, is offering the £20,000 reward through the independent charity Crimestoppers UK.

He had been married to Joanne for seven years at the time of her murder.

Her killer has never been traced, and Mr Mathers says he is determined to see those responsible brought to justice.

He said: "I want justice for Joanne, even after all these years."

Mrs Mathers' son, Shane, who was aged just two at the time of her murder, said: "I never really knew my mother because she was taken away from me far too early."

He added that "while our family appreciates that nothing will bring my mum back, we want those responsible for her murder to be found and brought to justice."