Can a tenant repair damages after their lease has ended (CT)?

[Sal Burges]

Hi All, 

Tenant of mine vacated the property at the end of the lease, left me with damages, and now wants to come back to repair the damages in order to get their full security deposit. I don't want them in the property due to #1 liability, #2 they are not qualified and #3 they've performed several repairs already, that are not to standard. State in question is Connecticut. 

Thanks for your help!!

SB