Hannah Overton was charged with capital murder, found guilty and handed down a life sentence. This week the 35-year-old was back in a Texas courthouse to try and get her capital murder conviction overturned and convince a judge she did not intentionally poison the four-year-old but that he did it to himself. The defense argued that Andrew had Pica an eating disorder characterized by an obsessive appetite. Overton and her husband told ABC's 20/20 that the boy would eat anything he could get his hands on. The day he collapsed in their home, Andrew was found in the pantry by...