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Stalking affects around 2m people every year, most of them women. Tonight, Panorama will look at the topic and see what the impact of a stalker can be on someone's life.

Simon and Lorna spoke to Detective Superintendent Jon Chapman, he is in charge of the County Community Safety Unit in Hertfordshire.

Dr Emma Short from the University of Bedfordshire, a psychologist who has studied stalking and the victims of stalking. She also helped the Panorama team.

And Carol Faruqui, from Protection Against Stalking, her daughter Rana was stalked and eventually murdered by her ex-boyfriend in Buckinghamshire in 2003.