The Los Angeles Times reports the death of Walter de Maria at

Throughout his career, De Maria cultivated a somewhat reclusive personality as far as the media was concerned. He seldom gave interviews and disliked being photographed. He also avoided participating in museum shows when he could, preferring to create his installations outdoors or at unconventional urban locations.

As a result, his work was not widely exhibited in the U.S. and he never became a household name. But critics championed his work, finding his large-scale installations to be conceptual and intellectually complex, while at the same time accessible to the general public.

Walter de Maria, Celebrated Sculptor, Dies at 77 (Los Angeles Times)