PHOTOS: Moms with a deadly past

<div class="meta image-caption"><div class="origin-logo origin-image ap"><span>AP</span></div><span class="caption-text">Mary Beth Tinning in 1987. She received a 20 years to life sentence for smothering her infant daughter with a pillow. (AP)</span></div>
A look at some of the mothers -- in Houston and beyond -- who faced time behind bars in the killings of their children.
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