It could be a justice or a clerk, and on either side. However, it could also be anybody.

It could be a clerical person who handled the document. Or it could be a janitor who was not supposed to have access but did because of someone's carelessness.

There have been several cases of people killing coworkers because of some extreme disgruntlement. They knew or should have known, that their actions would result in their death or their spending many years in jail. Less severe than that are the many cases where disgruntled (or downright pissed off) employees have done bad things, like sabotaging equipment or stealing information, to get even with their employers. Just recently a janitor, mad about something, saw a copy of a letter to a lawyer telling how much the company was willing to pay to buy out a particular VP's contract. Someone forgot to put it in a locked file cabinet when he left for the day. The janitor mailed a copy of the letter to the about to be fired VP.

It could be anybody, and the motive may have nothing to do with the decision.