Kaitlyn Conley was previously convicted of poisoning her ex-boyfriend's mother to death, but in a shocking twist, a New York court overturned her conviction, allowing her to walk free and leaving some to question whether she was wrongfully convicted.

"IMPACT x Nightline" reports on rare cases of IVF gone wrong, including a woman suing a fertility clinic after delivering a baby that wasn't biologically hers and a family swapping babies with a nearby couple after an embryo mix-up.