Erotomania is a type of delusional disorder where the affected person believes that another person is in love with him or her. This belief is usually applied to someone with higher status or a famous person, but can also be applied to a complete stranger. Erotomanic delusions often occur in patients with schizophrenia and other psychotic disorders, but can also occur during a manic episode in the context of bipolar I disorder. During an erotomanic delusion, the patient believes that a secret admirer is declaring his or her affection for the patient, often by special glances, signals, telepathy, or messages through the media. Usually the patient then returns the perceived affection by means of letters, phone calls, gifts, and visits to the unwitting recipient. Even though these advances are unexpected and often unwanted, any denial of affection by the object of this delusional love is dismissed by the patient as a ploy to conceal the forbidden love from the rest of the world.
Erotomania is also called de Clérambault's syndrome, after the French psychiatrist Gaëtan Gatian de Clérambault (1872–1934), who published a comprehensive review paper on the subject (Les Psychoses Passionelles) in 1921. The term erotomania is often mistakenly confused with obsessive love, obsession with unrequited love, or hypersexuality.
Margaret Ray was the woman who was obsessed with David Letterman. She stalked him and broke into his home a number of times. She eventually committed suicide.
Alicia Mangelsdorf fits the bill for Erotomania. She has a very unhealthy obsession with the Palins, Bristol in particular. She has also harassed Levi and Sunny Johnston to the point where the police were notified and they issued restraining orders against her.