Dr. Wilbert A. (Bud) King, 50, an assistant dean and member of the faculty of George Mason University, died Sunday at his home in Herndon after a heart attack.

He joined George Mason's music program in 1971, where he helped develop a training program for music teachers and worked to establish a university choral program.

As the university's choral director he directed choruses and the Collegium Musicum, a group specializing in Renaissance music and jazz. The GMU Chorus performed in Italy as part of the Bicentennial celebration in 1976 and also had appeared with the Richmond Symphony.

Dr. King came to the Washington area in 1962 and taught music at Williamsburg Junior High School in Arlington for a year before joining the faculty at Fort Hunt High School in Fairfax County, where he also served as a department chairman.

Before joining George Mason, Dr. King spent two years at the University of Maryland where he was a music instructor and earned a doctoral degree in education.

He was a native of Windber, Pa., and a 1953 graduate of Indiana University in Pennsylvania. He also earned a master's degree at the University of Maryland. He served in the Navy from 1953 to 1962.

Dr. King was music director of the Reston Chorale from 1972 to 1979. He also had been music director of the Bush Hill United Presbyterian Church in Alexandria and founded and directed the Mount Vernon Singers.

Survivors include his wife, the former Phyllis Broeseker, a daughter, Lesli, and a son, William J., all of Herndon; his parents, Mr. and Mrs. William King of Windber, and a sister, Jeananne Wilson, and a brother, Robert, both of Johnstown, Pa.

The family suggests that expressions of sympathy be in the form of contributions to the Wilbert A. King Memorial Fund, Office of University Development, at George Mason University in Fairfax.