Dr. Barkley C. Hathorne, 58, an international activities officer of the Alcohol, Drug Abuse and Mental Health Administration, died Oct. 10 at the U.S. Consulate in Karachi, Pakistan, following a heart attack.

Dr. Hathorne, who lived in Barnesville, Md., was born in Waltham, Mass. He served in the Army Air Forces in Europe in World War II and later earned bachelor's and doctoral degrees in theology at Boston University.

He served at various churches in the Boston area until 1961, when he moved to Washington to establish a pastoral counselling program at the Foundry Methodist Church.

In 1968 and 1969, he studied suicide at Johns Hopkins University. In 1970, he went to work at the National Institute of Mental Health. In 1975, he joined the Alcohol, Drug Abuse and Mental Health Administration in what is now the Department of Health and Human Services.

Dr. Hathorne was a member of the American Psychological Association and the American Association of Suicidology, a fellow of the American Association of Marriage and Family Counselors and a former president of the American Association of Pastoral Counselors. He had lectured at the George Washington Unversity medical school.

Survivors include his wife, Natalie, of Barnesville; two sons, Mark, of Mount Airy, Md., and Bruce, of Galesville, Md.; his mother, Esther Hathorne, of Waltham; two sisters, Ruth Olson, of West Newton, Mass., and Charlene Nims, of Sudbury, Mass.; two brothers, Gerald, of Lowell, Mass., and Robert, of Rochester, N.H., and one grandchild.