Dominique Johnson , 19 , was arrested on Wednesday and has been charged with conspiracy to commit armed robbery . She is the roommate and alleged girlfriend of Jamyra Gallmon , 21 , who February 9 was charged with first-degree murder . David Messerschmitt , 30 , was stabbed to death on last week at the boutique Donovan Hotel in Washington D.C. Gallmon has admitted to police that she set up the lawyer so that he was expecting to meet a man for gay sex at the hotel . When she attempted to rob him they got into a struggle and she pulled a knife from her pants and stabbed him repeatedly .
Dominique Johnson , 19 , was arrested on Wednesday and has been charged with conspiracy to commit armed robbery . She is the roommate and alleged girlfriend of Jamyra Gallmon , 21 , who last week was charged with first-degree murder . David Messerschmitt , 30 , was stabbed to death on February 9 at the boutique Donovan Hotel in Washington D.C. Gallmon has admitted to police that she set up the lawyer so that he was expecting to meet a man for gay sex at the hotel . When she attempted to rob him they got into a struggle and she pulled a knife from her pants and stabbed him repeatedly .