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

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.

Special prosecutor Hank Brennan admits evidence mistake in Karen Read's murder retrial as defense requests mistrial, with legal experts divided on whether the error was intentional

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.