John Malcolm (Mal) Lothschuetz, 57, a former government attorney who had been vice president and Washington counsel for the United Telecommunications Corp. since 1974, died March 20 after a heart attack. He was stricken near his office and pronounced dead at D.C. General Hospital.

Mr. Lothschuetz was a native of Springfield, Ohio, and served with the Army in Europe during World War II, earning the Purple Heart and Bronze Star medals. He was a 1952 graduate of the University of Cincinnati and earned his law degree at Catholic University.

He was an attorney with the Federal Communications Commission and the Civil Aeronautics board from 1954 to 1969. He spent the next five years with the United Telephone Co. of Ohio in Mansfield, where he was vice president, secretary, and general counsel.

Mr. Lothschuetz was a member of St. Luke's Catholic Church in McLean. He also was a member of Ohio, Maryland, and D.C. bar associations, the U.S. Chamber of Commerce, the Capitol Hill Club, and the River Bend Golf & Country Club.

Survivors include his wife, M. Elizabeth (Betty), of McLean; a son, Frank X., of Fairfax; three daughters, Ann E. Parish of St. Paul, Minn., Kathryn M. McKeon of Vienna, and Jane G. Lothschuetz of Burke, Va.; his mother, Gretta C. Lothschuetz of McLean; two sisters, Rosemary Kinkead of Columbus, Ohio, and Elise Siebentritt of McLean; a brother, Frank X., of Metarie, La., and four grandchildren.