"We arrested Barrister A K M Fakhrul Islam from his Segunbacha office this afternoon to face charges of stealing and leaking the draft verdict and sparking a massive controversy," a police spokesman said.
Islam is the lawyer of Chowdhury, who was sentenced to death on October 1 by the International Crimes Tribunal for committing crimes against humanity and genocide during the 1971 war.
She claimed that it was retrieved from the computer of the law secretary and was written by the law ministry to be delivered by the tribunal in a pre-dictated manner.
The tribunal later confirmed that an early draft of the verdict was leaked as part of "a big conspiracy" involving a huge amount of money and the government ordered an investigation.
A staff member of the tribunal confessed to his involvement in leaking the 164-page document but alleged that the convict's counsel assigned him to steal the copy.