A special “Dateline” is on Thursday with a two-hour episode on the case that has captivated the nation for weeks — the retrial of Karen Read. Here is a preview of Andrea Canning’s report: It has been more than two years since John O’Keefe was found dying in the snow.

Prosecutors alleged Read hit her boyfriend with her car after an argument. Her lawyers argued she was framed in a law enforcement cover-up.