when you heard walter ogrod, what were you thinking? who the hell's walter ogrod? andrea canning: coming up-- are you innocent? andrea canning: --an arrest. heartbreaking. i hated him. the only thing i could think of, was getting my hands around his throat. andrea canning: who was barbara jean's killer? tom lowenstein: they felt that barbara jean must have been killed on the block very near to where she lived. andrea canning: the search for an answer would uncover some long-buried secrets. lester holt: you're looking at the actions of the prosecutor or the police? both. the biggest part of this problem is not just innocent mistakes. the biggest part of this problem is the abuse of power. andrea canning: when "dateline" continues. [ music playing ] hey, flo. cool leg warmers. thanks. they are just for the bus ride to work. they are not part of the official uniform. no tunes today? no. my apartment was robbed last night. took my cable ready tv, vcr, portable cassette player. yup. all the latest tech. if only progressive had renter's insurance like their home insuranc