Margaret Anne Cargill, an heiress to the Cargill agribusiness fortune, and a philanthropist who anonymously gave away millions over her lifetime, died on August 1, reports The San Diego Union-Tribune. She was 85, and lived in La Jolla, Calif.

Ms. Cargill insisted on giving all of her donations anonymously, but agreed to make her gifts public upon her death.

Her grandfather was William Cargill, who in 1865 started the grain-storage firm that became one of the world’s largest private companies. Ms. Cargill gave money to the American Red Cross, in Washington; the American Swedish Institute, in Minneapolis; the Idyllwild Arts Academy, in Calif.; the Nature Conservancy, in Arlington, Va.; the San Diego Humane Society; and St. Paul’s Episcopal Cathedral, in San Diego.