Story highlights She was best known for her role opposite Patrick Dempsey in the 1987 movie "Can't Buy Me Love"

The family is awaiting autopsy results to determine the official cause of death

(CNN) Actress Amanda Peterson, best known for her role opposite Patrick Dempsey in the 1987 movie "Can't Buy Me Love," has died, her mother, Sylvia Peterson, said.

"She died on Friday morning. It's a big loss. Such a loveable person," Peterson said. "She had some medical problems with her heart but we don't know the cause yet."

The family is awaiting autopsy results to determine the official cause of death, Peterson said.

Amanda Peterson was 43 years old, married and living in Greeley, Colorado, where she grew up.

The actress began her film career when she was 9 years old with a part in the 1982 feature film "Annie," directed by John Huston, according to IMDB.com.

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