The federal investigation of former Maryland state senator Thomas L. Bromwell widened yesterday as prosecutors charged a construction company manager with lying to the FBI about work the company performed at Bromwell's home in Baltimore County.

In papers filed at federal court in Baltimore, David M. Jackman is accused of claiming falsely that he always intended to bill Bromwell for the work, which began in the summer of 2000, and that he waited until November of the next year to prepare an invoice only because he had been too busy before then.

Free or discounted work worth more than $85,000 at his home is among the favors that Bromwell allegedly accepted from the firm Poole and Kent, according to a 30-count racketeering indictment announced last week. He also was accused of accepting concealed payments worth more than $190,000.

In exchange, the indictment says, Bromwell used his influence inside and outside government to help Poole and Kent win construction contracts, to resolve contractual disputes in the company's favor and to expedite payments so that W. David Stoffregen, president of Poole and Kent during the time outlined in the indictment, could collect hefty bonuses.

The court filings do not identify Jackman's attorney, and attempts to locate a home telephone number for him were unsuccessful. He was charged in what is known as an information, a document ordinarily used when a defendant has agreed to plead guilty.

Marcia Murphy, a spokeswoman for U.S. Attorney Rod J. Rosenstein, said Jackman is scheduled to appear in court tomorrow. She said she could not comment on whether he has agreed to cooperate with the probe, which last month obtained guilty pleas and cooperation agreements from two construction executives, one of whom worked at Poole and Kent.

Robert Schulman, an attorney for Bromwell, declined to comment, saying the case is pending.

Staff writer Christian Davenport contributed to this report.