Who is Kathy Culver from Deal Breaker and what is their importance?

Kathy Culver was the second of three children. Her father, Adam, worked as the Medical Examiner in Bergen County, New Jersey. Her mother, Carol, is a devout Catholic and small business owner. Kathy's sister Jessica is a novelist and Myron Bolitar's ex-lover. Edward, Kathy's younger brother is the owner of a successful software development company. Kathy was blond and very pretty and was known to be perpetually cheerful.