The Mercy Ridge retirement community resident was 87.
The son of physicians, Mr. Marshall was born in Baltimore and was raised on Deepdene Road in Roland Park.
After graduating from Gilman School in 1942, he attended Princeton University for a semester before enlisting in the Army Air Forces. Trained as a navigator, he was sent to England, where he flew several missions with the 8th Air Force. He was later sent back to the U.S. to teach pilots navigation.
After the end of World War II, he earned a bachelor's degree in 1947 from the Johns Hopkins University and, later, a master's degree from Duquesne University.
Dr. Marshall was a member of the Gilman faculty from 1949 to 1965.
"I had him as a teacher. He was also our wrestling coach and taught Latin and history," said John E. Schmick, who is headmaster of Gilman. "He was very passionate about his subjects, wrestling and education. He was also highly respected by the boys and his colleagues."
William H. Gamper, who is director of admissions at Gilman, formerly coached wrestling at Boys' Latin School.
"Dicky was one of the successful wrestling coaches here, and he came after the legendary Ed Russell and Reddy Finney. When he was coaching here, it was the heyday of Gilman wrestling," said Mr. Gamper. "We had very successful teams, and he was very much a part of that."
Mr. Gamper said that even when Dr. Marshall no longer coached, he maintained his interest in the sport.
"You'd look up and he'd be in the stands at Maryland Scholastic Association wrestling matches. He just loved the sport," he said. "He was just a good, kind person."
Fred Maxcy, a retired career Air Force officer, knew Dr. Marshall since they were 14. "What a character. We went to Gilman and Hopkins together and were in the same fraternity. In fact, he was our valedictorian at Gilman," he said.
"He was the perfect combination of the teacher and coach. And when he was at Gilman, he was All Maryland in wrestling and was center on our lacrosse team, and he did very well there," said Mr. Maxcy.
Dr. James Beers, who is a professor of literacy education at the College of William & Mary in Williamsburg, Va., graduated from Gilman in 1964.
"Dicky was my Latin teacher and my wrestling coach. One of the things I've never forgotten was the first time I heard a Beatles song. I think it was 1963," said Dr. Beers.
"Before we would go to matches, the team would go to his house to relax. He lived on campus," he said. "I remember hearing the radio which was playing a Beatles song and thinking how cutting-edge Dicky was, and we didn't even know it."
Dr. Beers recalled Dr. Marshall as "an enthusiastic guy who was always very encouraging."
"He loved it when you won, and when you lost, he agonized with you," said Dr. Beers.
After leaving Gilman, Dr. Marshall taught at Phillips Academy in Andover, Mass., and was principal of a private school in Athens, Greece, in the early 1970s.
He later was assistant headmaster at Shady Side Academy in Pittsburgh, and headmaster of Waynflete School in Portland, Maine.
After leaving academe, Dr. Marshall returned to Roland Park and went to work for Chesapeake Life Insurance Co. as a salesman until retiring in 1982.
He returned to Johns Hopkins University and was 68 when he earned a doctorate in 1992 in Italian Renaissance economic history.
Dr. Marshall also was a teacher in the Renaissance Institute at Notre Dame of Maryland University.
He enjoyed spending time in Campagna, Italy, and liked hiking in Acadia National Park on Mount Desert Island, Maine, and sailing Frenchman Bay.
Formerly of Parkway Drive in Cedarcroft, Dr. Marshall had lived for the last several years with his wife of seven years, the former Martha Egerton, at the Timonium retirement community.
His wife of 60 years, the former Emily Brady, died in 2003.
Dr. Marshall had been a communicant of the Roman Catholic Cathedral of Mary Our Queen and the Roman Catholic Shrine of the Sacred Heart in Mount Washington.
A memorial Mass will be offered at 11 a.m. Oct. 22 at Mercy Ridge.
In addition to his wife, Dr. Marshall is survived by four sons, Ken Marshall, Billy Marshall and Charlie Marshall, all of Ellicott City, and Jim Marshall of Myrtle Beach, S.C.; two daughters, Berry Hoak of Williamsburg, Va., and Ellen Wood of Topsham, Maine; a stepdaughter, Martha Leipold of Lochearn; 11 grandchildren; and 10 great-grandchildren. His sister, Julia Brown "Judy" Marshall, a former Sun newsroom clerk who was married to author William Manchester, died in 1998.