In bacteria, the antibiotic tetracycline blocks the site where trna molecules enter the ribosome. the most likely reason that bacteria die from treatment with tetracycline is because the antibiotic

Tetracycline was discovered in the 1940s and is effective against both gram-positive and gram-negative bacteria. Tetracycline is an antibiotic which kills the bacteria by inhibiting the synthesis of protein.  

Tetracycline act by inhibiting the process of translation by preventing the binding of aminoacyl-charged tRNA to the A site of the ribosome.

Since the aminoacyl charged tRNA does not bind the A site therefore the process of translation is inhibited.