After the business was closed in the 1980s, Mr. Littleton went to work as a warehouse planner for Maryland Cup Corp., from which he retired in 1986.
He later worked as a "standardized patient" at the Johns Hopkins University School of Medicine, where he posed as a patient to give medical and nursing students hands-on experience in dealing with patients and developing a bedside manner, family members said.
Mr. Littleton fully retired in the 1990s after working for several years as a real estate appraiser.
He was a lifelong fan of big-band and Dixieland music and in a 1997 letter to the editor of The Baltimore Sun recalled his first live concert.
"I was seduced by big-band music a very early age (15), my first witness to a live performance being the Jimmie Lunceford band at Carlin's Park in 1937," he wrote. "I can remember to this minute the feeling of being swept away emotionally when that powerful, beautifully arranged and performed music literally pounded my heart and other internal organs."
Mr. Littleton said he later became a regular at the Royal Theater, Strand Ballroom and New Albert Hall. When he was in the Air Force during the 1950s, he attended a Louis Armstrong concert in Munich, and afterward, the noted musician invited him to dinner.
The longtime resident of Lyman Avenue in Govans, who moved to Bel Air in 2003, did not play an instrument.
"There was always music in the house and later in life he joined an Irish singing group," said a daughter, Susan J. Behm of Wiltondale
He was a member of the Grachur Club on the Magothy River, where he enjoyed sailing.
He was a member of the Unitarian Universalists of Fallston, 1127 Old Fallston Road, where services will be held at 11 a.m. Saturday.
In addition to his daughter, Mr. Littleton is survived by his wife of 34 years, the former Susan E. Mannion; a son, Stephen J. Littleton of Phoenix, Ariz.; another daughter, Barbara H. Littleton of Baltimore; a sister, Kathleen "Kacy" Littleton of Hunt Valley; a grandson; and four great-grandchildren. An earlier marriage to the former Jane Lee Johnson ended in divorce.