<P> Lizzie 's psychotic behavior and Mika 's innocence are addressed in the second half of the season , with the revelation that Lizzie was feeding rats to the walkers at the prison . Most notably during `` The Grove '' episode , Lizzie murders Mika , and intends to allow her to reanimate . Having found this out , and knowing that she also planned to kill Rick 's daughter , Carol made the decision to kill Lizzie . The scene sparked controversy among critics , who continue to refer to it as one of the darkest scenes and episodes of the series . </P>
<P> Lizzie 's psychotic behavior and Mika 's innocence are addressed in the second half of the season , with the revelation that Lizzie was feeding rats to the walkers at the prison . Most notably during `` The Grove '' episode , Lizzie murders Mika , and intends to allow her to reanimate . Having found this out , and knowing that she also planned to kill Rick 's daughter , Carol made the decision to kill Lizzie . The scene sparked controversy among critics , who continue to refer to it as one of the darkest scenes and episodes of the series . </P>
who was feeding the rats to the walkers
who was feeding the rats to the walkers
Lizzie
Lizzie