I don't know much about the law, but just relay what I've read about it in the press.
In a murder trial the presiding officer has to be a High Court Judge (Judge Thokozile Masipa in the Pistorius case).
This judge has to appoint two legal experts to assist her (assessors). Usually they have backgrounds in forensic science or psychology. They can overrule the desicions of the judge by simple majority.
The two assessors for this case have been appointed some time ago, but have not been publicly identified.
Judgement therefore is not the decision of one person alone. Thankfully.
It seems as if this is going to be a difficult he said/she said case. Time will tell.
Edited by Pressie, : Spelling