The jury in the Jordan Watson murder trial have asked the judge about the legal principle of "joint enterprise."

In a note to Mr Justice Nicholas Green, the jury asked a series of questions, including whether a person can be guilty through the joint enterprise principle for events before, during and after a criminal act.

They also asked whether if someone witnesses a murder and then helps to conceal it, are they guilty of murder through joint enterprise?

The jury also asked what would constitute an agreement between the defendants.

The judge told the jury that a guilty verdict to murder through joint enterprise would need a defendant to have agreed to take part in the act before it has happened and to have then played an "active" part in it.

"If a person learns that someone else has committed an offence, and they do some act to help that person after the offence, that person might be guilty of some entirely different criminal act, such as perverting the course of justice," said the judge.

"Then it is not murder."

An agreement need not be written down and could even be reached during the criminal act, he said.

The jury were released from their deliberations at 4pm. They will resume tomorrow at 10am.