bodies of their beloved daughters, demesha hunt and renisha landers. they were cousins, best friends, and now victims of what detroit police believe to be a serial killer. >> i wouldn't wish it on anyone. i wouldn't wish that they feel this pain. >> she meant everything in this world to me. everything in this world to me. >> why? why? they wasn't a threat to anyone. so how could you do something like this? >> one week later police say the killer struck again, claiming two more women and spreading fear in the streets of detroit. >> it's alarming, and obviously women in the city of detroit were very concerned. are these random acts? is it someone just snatching people off of the street? >> investigators discover a crucial circumstantial link between the two cases.