caitlin connelly, convicted of poisoning her boss and onetime mentor mary yoder, the mom of her on again was unthinkable that anybody would want to murder mary. >> the case picked apart across the country, going viral in the abc news studios series. little miss innocent. >> so if it wasn't me, who was it? >> prosecutors say she killed her ex-boyfriend's mother to get back at him. >> it just hit everyone. am i working with someone that would kill me? am i living with someone who would kill my mom? >> now 31, caitlin has spent the last seven years in prison. >> all right. >> but late last month, a stunning decision. a judge overturning her conviction. >> with this latest twist, i think people are thinking. is caitlin connelly an innocent person wrongfully convicted, or is she a calculated criminal who evaded justice? >> everybody loved my mom. she just was. happiness. happiness and love and light. it just. >> mary yoder was a mother of three who could light up a room. >> this is going to be an attempt to remember the evidence from yesterday. well, some of the steps, because i don't remembe