Does fired property manager owe me money for...

[Andrew Robbins]

In November, I fired my property manager for general ineptitude.  On December 1, a tenant abruptly moved out with no notice.  When this tenant signed their lease last spring, they pre-paid their last 3 months Mar '18 to May '18 in advance, in lieu of deposit (I inherited this lease when I bought the building, so I didn't set up the lease).  On Dec 1, the tenant abruptly moved out.  Come to find out: the tenant hadn't been paying rent the last three months -- they blew through all their pre-paid rent, and now I'm left with $0.  My fired property manager never told me that the tenant was using his pre-paid rent for Sep, Oct, and Nov of 2017.  And more galling, property manager was charging me a management fee for Sep, Oct, and Nov on that rent.  Question: what does my property manager owe me, if anything -- management fee?  lost rent for the time it takes to get a new tenant?  nothing?  Is this fraud or just negligence?