Roy M. Stockman, 90, a retired national examiner for the Interstate Commerce Commission who was active in Masonic groups, died of cardiac arrest Tuesday at a hospital in Frederick, Md.

Born in Frederick County, Md., Mr. Stockman worked for the Baltimore & Ohio Railroad there before World War I. During the war, he worked for the Eddystone (Pa.) Rifle Plant.

In 1920, he moved to Washington and worked as an accountant for the B & O Railroad before joining the ICC in 1927. He was a national examiner for the commission until his retirement in 1956.

Mr. Stockman lived in Washington and Chevy Chase for nearly 60 years before returning to Frederick in 1979.

He earned a law degree from the National University School of Law, which is now part of George Washington University.

A longtime Mason, he was a member of the Washington Commandry No. 1 of the Knights Templar, the Almas Temple, and the Five Points Masonic Club of the Interstate Commerce Commission. He also was a member and former high priest of Lodge No. 14 of the William R. Singleton Chapter and a former grand high priest and member of the committee on works and lectures of the Grand Chapter.

Survivors include his wife of 70 years, the former Ida Frances Summers, of Frederick.