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Software created by Nottingham-based company, Altia, could help families find answers.

Nicola Gilroy meets a woman who says she has renewed hope of finding her brother, who has been missing for 28 years.

For more information about missing people, or if you have information on Marcus Rigby, you can call the Missing People Helpline, external on 116 000.

Image: Locate International/The last image taken of Marcus Rigby, uncovered by the software