You do not state whether this person is a family member or a tenant that you have a rental agreement with. However, either way, you best bet is to send them a Demand for Possession. This can be done for non-payment of rent, or just to terminate the tenancy. If they don't move after they receive this, you will have to file a complaint in your District Court to obtain a Judgment of Possession. If they don't move then, you have to apply to the Court for a Writ of Eviction and have them physically removed from the property. Best of luck with all of this.
Answered on Feb 12th, 2013 at 7:22 PM