"This was not only a play on his name but also a statement about what he did for his clients in criminal cases," said Murray Hill neighbor Rush Loving, a retired Fortune magazine editor and author who is married to Jane G. Loving.

In a 1982 article in The Baltimore Sun, Mr. Walker explained how he approached his work.

"If I'm called into a case just weeks before the trial, I'll get a postponement so I can research the case and do a good job for my client," he said.

"He was consummately prepared. He taught me that a case was about preparation, preparation and more preparation," said Judge Chester.

For the past 13 years, Marc Zayon was Mr. Walker's law partner.

"He was a phenomenal mentor and was always willing to help young attorneys who had problems," said Mr. Zayon, who added that Mr. Walker also kept in touch with his clients.

"He did the follow-up. He never forgot them," said Mr. Zayon. "They called him 'Mr. Roland,' and they were always calling, sending cards and letters, even though he had retired."

Mr. Zayon said that when he has a legal problem or an entanglement, he immediately thinks "WWRD."

"That means, 'What would Roland do?' and then you get an answer," said Mr. Zayon.

Mr. Walker was a volunteer attorney with Volunteers in Service to America, and served as counsel to numerous grass-roots organizations and housing and human rights groups for economically disadvantaged people.

He lectured at the University of Baltimore School of Law and was vice president of X-Cell Inc., a residential drug and alcohol treatment center.

For the past year, Mr. Walker lived in Lutherville. He was a member of Beth El Congregation.

Services were held Tuesday at Sol Levinson & Bros.

In addition to his son, Mr. Walker is survived by his wife of 33 years, the former Vada Simpson; another son, Robert E. Walker of Chevy Chase; three daughters, Hope E. Slonim of Falls Church, Va., Nicole Upton of Forest Hill and Lindsey Smith of Owings Mills; and seven grandchildren. An earlier marriage to the former Norma Tucker ended in divorce.