Dead body in my apartment

Generally speaking, there have been courts that have ruled that a failure to disclose that a person died in a house or apartment that was marketed for sale or for rent is required to be disclosed to the prospective buyer or renter. And a failure to disclose that fact will render the contract to rent or To purchase the house or apartment void/voidable at the option of the buyer/renter. However the expense based on your situation of going ahead with court action to get an order voiding the contract so that you can vacate the property would probably be worth more trouble than it's worth. So you should retain counsel to write a demand letter to renegotiate the terms of the contract or to let you out of the contract based on this non-disclosure. And counsel should site relevant caselaw to support his position.