Sneak peek: Bloodlines

Renee McBryde and Samantha Byran live worlds apart but share a terrible truth. They are the innocent offspring of cold-blooded killers, their fathers both convicted murderers. But discovering that dark secret hasn’t been the only torment for these two young women. More troubling is the lurking question: Are killers made or born? And is there such a thing as a murder gene?

Reporter: Liz Hayes

Producers: Nick Greenaway, Eliza Berkery