Annie Dillard, the acclaimed author known for her poetic explorations of nature and spirituality, died Tuesday at her home in South Wellfleet, Massachusetts. She was 81. According to her literary executor, Maggie Nelson, Ms. Dillard passed away from natural causes at the residence overlooking the cove she cherished.

Ms. Dillard’s career spanned several decades and encompassed nonfiction books, essays, novels, and poetry. She gained wide recognition with her 1974 work, "Pilgrim at Tinker Creek," which won the Pulitzer Prize for General Nonfiction in 1975. The book includes a widely cited passage describing the demise of a frog at the hands of a giant water bug—a scene emblematic of her ability to capture the intimate and often brutal details of the natural world with lyrical precision.

Born in Pittsburgh and educated at Hollins College in Virginia, Ms. Dillard was noted for her unique voice that defied easy classification. Book critic Gail Caldwell described her as a “seeker, Christian mystic, explorer, philosopher, naturalist, and a writer ‘posing as a hillbilly,’” reflecting the various facets of her writing and outlook. Reviewers often compared her to Henry David Thoreau, whose work influenced her early thinking, although she forged her own distinctive path in both life and literature.

Following the Pulitzer, Ms. Dillard relocated to Bellingham, Washington, seeking a quieter life away from public attention. Her experiences there informed her subsequent book, "Holy the Firm" (1977), a brief but intense prose work in which she continued her meditation on nature, divinity, and mortality. The book opens with the reflection, “Every day is a god, each day is a god, and holiness holds forth in time,” and contains vivid imagery such as a moth flying into a flame, echoing themes from "Tinker Creek."

In later years, Ms. Dillard divided her time between Washington and Cape Cod. Provincetown and the surrounding dunes on Cape Cod were a frequent setting, most notably in her 2007 novel, "The Maytrees." The story traces the lives of Lou and Toby Maytree, residents of a sandy, windswept peninsula shaped by coastal currents and the erosion of ancient cliffs—an environment richly evoked in her writing.

Ms. Dillard’s body of work also includes "Living By Fiction" (1982), "Encounters with Chinese Writers" (1984), and "The Living" (1992), her first full-length novel. Throughout her career, she was celebrated for blending philosophical inquiry, spiritual exploration, and natural observation in prose marked by vivid, contemplative language.

Her death marks the passing of a distinctive voice in American letters—one that brought a profound curiosity and poetic sensibility to the observation of life’s fleeting moments in the natural world.