Sadler was born on October 28, 1882, in
Paris, Arkansas. He graduated from the
University of Arkansas in 1905, and earned his law degree from
Washington and Lee University School of Law. Sadler married Jessie McGaugh, a native of
Gentry, Arkansas, on August 27, 1911; they had two sons: Daniel Jr. and Robert G. Sadler had multiple heart attacks in the 1950s. He retired May 15, 1959. His health continued to deteriorate, and he was admitted to
St. Vincent Hospital in Santa Fe on March 11, 1960. His condition steadily worsened, and he died in the hospital the evening of April 2, 1960. ==Legacy==