Joseph Anthony Dean, 43, a ranger in the national park system and a former resident of the Washington area, was found dead Nov. 1 at the foot of a cliff in the Grand Canyon National Park in Arizona.

A spokesman for the U.S. Park Service said Mr. Dean, an instructor at the Albright Training Center at Grand Canyon National Park, was leading a group of student rangers on an overnight hike. His sleeping bag was found empty and the students found his body at the foot of a feature called Horseshoe Cliff where he had fallen, the spokesman said. The death was ruled an accident.

Mr. Dean was born in New York City and grew up in Washington. He graduated from Spingarn High School in 1955 and earned a bachelor's degree at Bowie State College in 1968. In the years between, he worked for the Veterans Administration and then the Postal Service.

He joined the Park Service in 1970 and was a park technician in the Washington area. He later became a ranger and was assigned to Yellowstone National Park in 1977. He transferred to the Grand Canyon National Park as an instructor last year.

Survivors include his wife, Wilma, a daughter, Kia, and a son, William Anthony, all of Grand Canyon, Ariz.; his mother, Molly Dean of Washington, and two sisters, Phyllis Nophlin of Washington, and Iris Black of San Francisco, Calif.