A woman who befriended Casey Anthony in jail told police she confided she would "knock out" daughter Caylee, 2, so she could go out at night. Hundreds of pages of jailhouse letters offer a glimpse of Anthony's thoughts.<img src="http://feeds.feedburner.com/~r/rss/cnn_crime/~4/ApaOcfFCUro" height="1" width="1"/>
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