Tenant moving in a criminal released from prison with her in a 2-flat without notifying me

[Atul Mohlajee]

I have a tenant I inherited when I bought this 2-Flat in July 2013 in Cook County, Illinois.  She has 3 kids and has been a good tenant so far.  Timely rent, no damage, no excessive complaints.  Police called me today and notified that a person released from prison is moving in this property I own, on this Friday with my tenant.  She did not notify me nor seek approval to move in this person with her.  I donot want this person in my property.  I signed a "No Tresspass" clause with the Village so they will have authority to arrest any tresspasser on this property.  Tomorrow, I will be putting  "No Tresspassing" signs on this property.  It is a month to month lease.  I am also planning to give her a written warning that she cannot move in anybody who is not on the lease with her.  I would actually want this tenant out ASAP in order to avoid any more problems with her in future.  This person was convicted of large amount of dangerous drugs and spent a few years in prison.

Any advise will be appreciated.             

[Brie Schmidt]

@Atul Mohlajee what does your lease say?  send it to me if you want and I will read it, but there should be a clause about unauthorized occupants staying more than X amount of days without approval.