The Karen Read trial on Friday focused on controversial testimony about the alleged collision involving Read's SUV and John O'Keefe. The only witness on the stand all day was Daniel Wolfe, a crash reconstructionist for engineering consulting firm ARCCA.

CNN highlights about a dozen witnesses called over the last eight weeks, whose testimony illuminated key pieces of the theories presented by prosecutors and Read’s defense.

Karen Read’s attorneys are making a final push, preparing to call their final witnesses to the stand in her murder retrial.Read<a class="excerpt-read-more" href=" More

For the second time in a week, Judge Beverly Cannone denied Karen Read's attorneys' request for a mistrial after they accused the prosecution of misconduct.

For weeks, all appearances were that prosecutors would call witnesses as part of a brief rebuttal case in the Karen Read retrial, giving them the opportunity to get the last word after damaging testimony from expert witnesses for the defense.