why didnt the narrator go to the trial?

The narrator was fully aware that he didn't have to attend the trial to learn the outcome. Jefferson was certain to be found guilty. 

"I was not there, yet I was there. No, I did not go to the trial, I did not hear the verdict, because I knew all the time what it would be. Still, I was there."

a lesson before dying

what was jefferson's reaction to the murder?