Defense attorneys for Karen Read rested their case Wednesday, bringing her retrial for the death of her Boston police officer boyfriend one step closer to its blockbuster conclusion.

A Massachusetts jury has begun deliberating in Karen Read's second murder trial over the killing of her police officer boyfriend.

After the defense wrapped up its questioning of Rentschler, Prosecutor Hank Brennan told the judge he did not plan to call any more witnesses, reversing an earlier request to recall a different crash expert. The lawyers agreed to begin their closing arguments at 9 a.m. Friday. They'll then hand the case to the jury.

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 defense rested its case after a biomechanical engineer told jurors John O'Keefe's injuries were inconsistent with a car crash.

A broken taillight. A dead cop. A bombshell admission. The jury is now deliberating over whether Karen Read killed John O'Keefe.

After nearly two months of testimony, Karen Read’s retrial for the murder of her boyfriend John O’Keefe is in its final days. The defense has now rested its case, without Read taking the stand. NBC News’ Emilie Ikeda reports.