A not guilty plea was entered on behalf of Nora T. Nelson by her lawyer during her arraignment Friday in the Charlestown division of Boston Municipal Court.

The Boston attorney who was found stabbed to death on his houseboat was wrapped and weighted down, a prosecutor said.

A 24-year-old named a “person of interest” in connection with the death of a man on a luxury houseboat in Charlestown now faces a murder charge, prosecutors said Thursday. Nora Nelson was arrested at the scene of the man’s death on Sunday night on a trio of warrants charging her with a variety of domestic violence offenses unrelated to the Charlestown case.