John T. Toomey, 60, a lawyer and a former judge of the Montgomery County Orphans Court, died of cardiac arrest Thursday at Suburban Hospital in Bethesda. He lived in Kensington.

Mr. Toomey had maintained a law practice in Washington for many years before moving his offices to Kensington in 1968. He specialized in wills and estate laws.

In 1962, he ran unsuccessfully as a Democrat for judge of Orphans Court. When his opponent, Richard E. Snyder, a Republican who defeated him, resigned in 1965, Mr. Toomey was appointed to the position by then Maryland governor J. Millard Tawes.

The judgeship was eliminated a year later when Orphans Court was absorbed by the Montgomery County Circuit Court during a reorganization of the court system.

Mr. Toomey was born in Washington. He was a graduate of St. John's College High School and Catholic University, where he also earned a law degree after World War II.

During the war, he served as an Army artillery captain in North Africa, Sicily and Italy.

During 1955-60, he taught wills and estate administration and domestic relations at Catholic University Law School.

He was a former national president of the Catholic University Law Alumni Association. He belonged to the District of Columbia Bar and the Bar Association of the District of Columbia, the Maryland Bar Association and the American Bar Association.

Mr. Toomey was a former president of Montgomery County deanery of the Archdiocesan Council. He had been president of the Holy Name Society of Holy Redeemer Catholic Church in Kensington and Chairman of the board of trustees of St. Ann's Infant and Maternity Home in Hyattsville. He was a member of the Rosensteel Council of the Knights of Columbus, the Uptown Lions Club and the Metropolitan Washington Board of Trade.

He is survived by his wife of 38 years, Betty S., of Kensington; six children, John J. Jr. and Robert M., both of Gaithersburg, Sharon Boyle of Richmond, and Joseph E., Ann E. and Stephen J., all of Kensington; a sister, Catherine Brown of Rehoboth Beach, Del.; three brothers, James E., of Oakland, Calif., T. Murray, of Chevy Chase, and Robert J., of Richmond, and four grandchildren.

The family suggest that expressions of sympathy be in the form of contributions to St. Ann's Home.