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From a purely legal perspective, the estate of the deceased is responsible for the rent on the property until they remove all property, turn in the keys, and you re-rent to someone else. The fact that the tenant is deceased doesn't end the estate's obligation to pay rent.
So at this point, you can submit a "creditor claim" against the estate for any unpaid rent by sending it to the executor and a copy to the Surrogate court where the case is. If the executor refuses to pay the rent, then you can file suit against them under a breach of contract claim in small claims court.
With that said, I would suggest contacting the police yourself and finding out if you can remove the tape so you can legally enter and get the place ready to re-rent so you can mitigate your damages for lost rent.