getting a tennant to move out?

[Joshua Hill]

I have just purchased a duplex. One side has a tennant that I want to vacate the property since her current lease is up. I would like to renovate the property and have a feeling she is not going to be cooperative. I know she has not paid her rent at all in the last 4 months of this lease. The current lease aggreement she had with previous owner is ending in this month. My question is, once I give her written notice to vacate the property at the end of the month and she doesnt leave, can I legally change the locks and lock her out since I dont have any lease aggreement with her?