Can you walk away without worry? No. There is a chance the landlord will sue you. There is a chance they will add you to a "deadbeat tenants" list (the later is unlikely for a small absentee landlord). If they send you a demand letter (especially one from an attorney) making it appear that they will sue, you should definitely get a lawyer.
If you are still in the property, you should contact a lawyer and learn the precise steps you need to take to get out of the lease.
In order to terminate a lease early for health and safety conditions, you must follow the proper procedures precisely. Further information can be found here: http://texastenant.org/ and here: http://www.avvo.com/legal-guides/ugc/statutory-process-for-a-tenant-to-terminate-residential-lease-in-texas
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