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ST. LOUIS (AP) - William S. Knowles, a chemist at Monsanto Co. in St. Louis who shared the Nobel Prize in chemistry, has died at 95.

Knowles, of the St. Louis suburb of Chesterfield, Mo., died June 13. His daughter, Lesley McIntire of Kirkwood, Mo., says he died of complications from ALS.

Knowles retired from Monsanto in 1986 after 44 years with the company. But it was 15 years later when Knowles was 84 that he and two other scientists won the Nobel Prize in chemistry. Their work led to discoveries now used to make various medicines, including antibiotics, heart drugs and widely used treatment for Parkinson's disease.

His body was cremated. A memorial service will be at 2 p.m. June 30 at Episcopal Church of the Good Shepherd in suburban St. Louis.

(Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)

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