The body of Billy Dean Sasseen, 24, a 1973 graduate of Thomas Jefferson High School in Alexandria and a resident of the Washington area for 15 years, was found June 11 at the foot of a 100-foot mountain ledge near Juneau, Alaska.

Mr. Sasseen moved to Alaska from Alexanderia nine months ago and was an assistant accountant at the Juneau Hilton Hotel at the time of his death.

An Alaska state trooper said Mr. Sassen left the trailer court where he lived on June 7 for an overnight hike on the 3,000-foot Thunder Mountain. His roommate reported him missing on June 9. Two days later, his body was found by two Juneau firemen after an extensive search that included the use of helicopters and dogs.

Mr. Sasseen was born at Fort Bragg, N.C., when his father, now a retired Army lieutenant colonel, was stationed there. The family moved to the Washington area in 1964.

Mr. Sasseen was a varsity football player and wrestler at Jefferson. He also was active in the Fellowship of Christian Atheletes. He attended the University of Virginia.

He was a member of the Lincolnia United Methodist Church in Alexandria.

In addition to his father, Jack A. Sasseen, survivors include his mother, Helen M. Sasseen, and a sister, Cathy, all of Alexandria, and two grandmothers, Bobby Sasseen of Sault Sainte Marie, Mich., and Hattie Estelle Martin, of Waverly, Tenn.

The family suggests that expressions of sympathy be in the form of contributions to the Lincolnia United Methodist Church, or to a charity of one's choice.