AUBURN, Maine — A 30-year-old Lewiston man has made a court appearance on a murder charge in the death of a 22-year-old woman who advertised escort services on the Internet.

Buddy Robinson was arraigned Thursday in Androscoggin County Superior in Auburn.

Robinson was charged last month in the death of Christiana Fesmire, who was last seen in July and whose body has not been found. In a police affidavit, investigators said Robinson drowned Fesmire in the bathtub of her apartment, which was in the same building where Robinson lived, but police do not indicate a motive.

An affidavit said Fesmire was part of an online prostitution ring led by Robinson’s sister, who told police that her brother confessed to the killing.