Nikki Bacharach, 40, died "quietly and peacefully" at her home in the northern Los Angeles municipality of Thousand Oaks on Thursday night, a statement said.
The spokeswoman declined to specify the cause of death.
She was diagnosed with Asperger Syndrome following her premature birth in 1966, and her father recounted her struggles that year in the song "Nikki." Sufferers often have obsessive routines and extreme sensitivity to sounds, smells and tastes.
Her parents, who divorced in 1980, had no other children together.
Bacharach, 78, who with Hal David composed such songs as "What the World Needs Now Is Love" and "Alfie," has three children from subsequent marriages.
Dickinson, 75, is probably best known for her role as sultry Sgt. Suzanne "Pepper" Anderson in the 1970s cop show "Police Woman."
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