You're stuck with the lease - there are no laws that allow you to get out because of a death in the family, etc.
If you can't pay, the landlord has the right to put a note on your credit that you've breached the lease. Also, the landlord can sue you for the amount of rent you're due.
However, your landlord is required to find someone to take up your lease. You should try to work with the landlord to find a replacement. If you are cooperative with the landlord, it will help you and also may keep him from filing anything on your credit.
When a landlord has a tenant move out, he/she must mitigate his or her damages by finding a replacement tenant.
The landlord cannot simply wait until the end of your lease and then seek the entire amount from you.
You can google mitigation of damages by landlord and find several resources out there.
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