John J. “Jack” Mitchell Jr., 72, who retired in 1998 as associate general counsel at what is now the Government Accountability Office, died March 8 at the ManorCare nursing home in Arlington.

The cause was cancer, said his brother, Jerome E. Mitchell.

Mr. Mitchell worked at what was the General Accounting Office from 1968 to 1995. According to his brother, Mr. Mitchell had a role assisting the Senate Judiciary Committee during confirmation hearings for U.S. Supreme Court and federal court justices, including the nominations of Antonin Scalia, William H. Rehnquist and Robert H. Bork to the high court.

John Joseph Mitchell Jr. was a native Washingtonian and a 1958 graduate of Wilson High School. He was a 1962 graduate of Saint John’s University in Collegeville, Minn., and a 1968 graduate of Catholic University law school.

His memberships included Springfield Golf and Country Club, and he traveled annually to the U.S. Virgin Islands to sail and play golf and tennis. He was a Springfield resident.

Survivors include wife of 21 years, Kathleen Galloway Mitchell of Springfield; a sister, Kate Mitchell of West Barnstable, Mass.; and two brothers, Jerome E. Mitchell of Kensington and Peter E. Mitchell of Tampa.

Adam Bernstein