The Oscar-winning-actress - who has been at the Cook County courtroom in Chicago since Monday observing the trial of William Balfour - left the room when a retired chief medical examiner showed the gunshot wounds suffered by seven-year-old Julian King.

However, her fiancé David Ortunga stayed behind to take extensive notes.

Julian was found dead in a car three days after police discovered the body of Jennifer's mother Darnell and brother Jason were discovered in their Chicago home.

As the images of Julian were discussed in court, William was passed a tissue and he was seen dabbing his eyes.

When the testimony ended, Jennifer returned to the room.

Prosecutors allege William flew into a jealous rage after he thought another man had given Julia a gift of balloons which he saw.

Balfour is charged with first degree murder in their deaths in addition to home invasion, aggravated kidnapping, residential burglary and possession of a stolen motor vehicle.

He has pleaded not guilty.

The trial is expected to last for approximately four weeks.