S Roc News Today

Person, is that a thing? the clues pointed in so many different directions, it really was -- it was a total mystery. >> reporter: theres a concept in the law known as a dying declaration. with those three letters scrawled in karens own blood lead to the apprehension of her killer? >> coming up, investigators dig into that three-letter mystery. who or what was roc? when dateline continues. s roc? when dateline continues. cold-eeze® can shorten your cold by 42%. it releases zinc ions that some sc...