Police say a 24-year-old woman gave them fake names and refused to answer questions when they arrived at a Charlestown houseboat for a well-being check. She was arraigned Friday on a charge of murder.

Police were conducting a welfare check at the houseboat, which was docked at the Charlestown Marina, when they found the body of Joseph Donohue, 65, police said.

A distraught friend of the victim said he was a Boston lawyer and a divorced father of three. Sources said his dog was also found dead in the harbor.