So he wanted to go free because he had been in for life, and that life ended.
Another past life scenario that could be played out in a case would be where you have, in a past life, uncovered evidence of a crime, and then you were found out by the bad guys, and they killed you. Then in a future life when the bad guys are still alive you remember that evidence and bring it forward, and it leads to their conviction and execution.
Then they come back to kill you again . . .