Prosecutors allege that Davis orchestrated the drive-by shooting and supplied the gun used to kill Shakur. Defense attorneys argued the recording should not be used as evidence, because Davis was told at the time he would not be charged. The judge is also allowing prosecutors to use the memoir during the trial, over the objection of Davis’ attorneys. With so many witnesses to the crime deceased, the book may do more to tie Davis to Shakur’s death than any other evidence. In Davis’ case, prosecutors are relying on his own statements — to police and in his memoir — as they try to persuade jurors beyond a reasonable doubt that he’s behind the mystery that has spanned three decades.