The term Stalker characterises one who has an intense voyeuristic obsession with a particular person. This obsession leads them to physically follow a person from place to place and observe them.
Stalkers most commonly attempt to remain hidden from their victims.
... with no husband present, and 17.9% are non-families. 13.4% of all households are made up of individuals and 5.5% have someone living alone who is 65 years of age ...