Jurors hearing the case outside Chicago have entered court each day for at least a week wearing the same colored clothing.

Tuesday, virtually all wore some shade of green. Before starting a three-day break Friday, they wore black. On Thursday, it was blue and Wednesday it was red.

The unusual display has left courthouse observers scratching their heads. But there's no way to tell what the jurors are thinking. They're barred from communicating with reporters or other trial participants.

Defense attorney Joel Brodsky says he noticed the color coordination but it doesn't bother him.

Meanwhile, a pathologist testifying for the state says a gash on the back of his third wife's head wouldn't have caused her to pass out and drown.

Mary Case's testimony Tuesday is meant to counter suggestions from the defense that Kathleen Savio slipped accidentally in her bathtub, hit her head, lost consciousness and drowned. As Case spoke, prosecutors projected autopsy photos of Savio's head with the top of her skull cut away. Some jurors shifted uncomfortably in their seats at the grisly display.

Peterson has pleaded not guilty to killing Savio in 2004. She was found dead in her bathtub.

Case says the 2 inch-long gash only damaged the thick layer of skin around the skull. She says there was no brain damage.