Tenant stays beyond lease end date - Landlord rights?

[Ben Kirchner]

This is in a property, in Missouri.  I have a tenant who has been behind on rent for months, and lately has not paid anything.  HIs lease was set to end 7/31.  I communicated via email on 6/30 that his lease would not be renewed.  He has been on the property well beyond the lease end date.

As the landlord, what rights do I have to reclaim the property?  What would be the next steps?  Do I need to send certified mail, and go through the eviction process?  If that is the case, anyone who has gone through this - steps to take provided would be appreciated.