Showdown after prosecution's major crash reconstruction

Wednesday saw the culmination of the prosecution's case against Karen Read, their key crash reconstruction expert sharing his conclusion about what happened to John O'Keefe — or what the judge allowed him to share. Then, the defense began working to poke holes in the argument. Here's what happened in a stop-start day in court, and how important our legal experts say it could prove to be when the jury considers whether to convict Read. Plus, what the expert revealed about how he obtained the replica of Read's SUV that he used in testing.