Carol Ann Kourtz Platt, 57, a former biological oceanography researcher who since 1997 had worked at Suburban Hospital in Bethesda as an assistant reference librarian, was found dead Nov. 12 at her home in Bethesda.

A spokeswoman for the Maryland Medical Examiner's Office in Baltimore said an autopsy report is awaiting test results.

Mrs. Platt was the administrative assistant to the director of the Allan Hancock Foundation for Marine Sciences at the University of Southern California when her family moved to Bethesda in 1983.

Since then, she had participated in community organizations. She was an English composition assistant at Bethesda-Chevy Chase High School from 1988 to 1990 and a media assistant from 1991 to 1994 at Wyngate Elementary School in Bethesda, where she also had been president of the PTA.

She received a master's degree in library science from the University of Maryland in 1995 and worked at the university's McKeldin Library. She also volunteered at the National Library of Medicine.

From 1996 to 1997, Mrs. Platt was a reference desk librarian at the Center for Strategic and International Studies in Washington.

She also chaired the library advisory committee for the Davis Community Library in Bethesda.

Mrs. Platt was born in Lynn, Mass., and graduated with a bachelor's degree in medieval English from the University of California at Berkeley in 1976.

She spent the first half of her professional life in the field of biological oceanography, beginning as a curatorial assistant in the museum of comparative zoology at Harvard University.

Mrs. Platt also worked in the Marine Biological Laboratories in Woods Hole, Mass., and in the biological oceanography division of the Scripps Institution of Oceanography in La Jolla, Calif.

She was a member of the Medical Librarian Association and the Association of College and Research Libraries.

Survivors include her husband, Christopher Platt, and their three children, Andrew, Brian and Katharine, all of Bethesda; her mother, Mildred Kourtz, of Lynn, Mass.; and a brother, David Kourtz, of Melrose, Mass.