Rent Check stolen and Cashed

[Jared Larry]

I purchased an owner-occupied triplex in December that I will not be able to occupy until February (203k). One of my inherited tenants currently cannot work and is having his rent paid by a non-profit.  Yesterday I called the non-profit to let them know I would be posting a pay or quit notice on the tenant's door for non payment of rent (the paperwork was filled out 12/30) if they could not tell me the status of the check.  The tenant's case worker informed me that the check had been mailed to the correct address and had been cashed 1/8.  The signature on the check was my name, but obviously did not match my signature.

The case worker said she will look into what can be done on her end, but I am not sure what my course of action should be.

Should I call the police?

Is the bank that cashed the check liable in this situation?

Any input would be greatly appreciated.