NEW YORK (CNN/Money) - Jeremiah Gutman, a Manhattan civil rights lawyer who testified recently in the Martha Stewart case, has died after an apparent heart attack.

The New York Civil Liberties Union reported on its Web site that Gutman, 80, died Wednesday.

Jeremiah Gutman, who just testified in the Martha Stewart trial, has died of an apparent heart attack.

Gutman was taken to a hospital after suffering a heart attack at a train station but could not be revived, the New York Times reported Thursday.

On Monday, Gutman was called as a defense witness in Stewart's trial by lawyers for Peter Bacanovic, Stewart's co-defendant, to testify about advice that he gave Douglas Faneuil, the government's star witness in the case, in the first few months of the investigation into Stewart's sale of her ImClone Systems (IMCL: Research, Estimates) stock.

Gutman had represented Faneuil briefly during the investigation.

Gutman, who joined his father's law firm, Levy, Gutman, Goldberg & Kaplan, in 1949, was practicing law right up until his death, the Times reported. He earned a Purple Heart while serving in Europe in World War II and had graduated from New York University Law School, where he was editor of the Law Review, the newspaper said.

In 1951, Gutman joined others in founding the New York Civil Liberties Union, partly because of what he others saw as civil rights violations in Senator Joseph McCarthy's campaign against Communists, the paper added.

He was also a member of the board of the American Civil Liberties Union at the time of his death, the Times article said.

Stewart's lawyers rested their case Wednesday after calling just one witness, while Bacanovic's defense team rested its case after calling five witnesses, including Gutman, over three days.

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Stewart herself did not take the stand, and her attorneys expressed their belief that federal prosecutors had failed to prove their case.

Closing arguments in the trial are set for Monday and Tuesday, after which the case will go to the jury.

Stewart and Bacanovic are charged with lying to investigators about her sale of ImClone stock in December 2001. Stewart is also charged with securities fraud.

Government lawyers rested their case last week after calling 21 witnesses.