BRUNSWICK, Ga. -- From autopsies to blood spatter evidence, experts testified Tuesday that Guy Heinze Jr. probably didn't kill his family. But if he did, he didn't do it alone.
Forensic pathologist Dr. Jonathan Arden was first on the stand. An expert in his field, Arden testified he had never seen a crime quite like this, where just one man was accused.
He said, "This is an extraordinary circumstance, in my opinion, inconsistent with anything I've ever seen where one person could perform all those acts and control all those people without himself being overcome."
Heinze is accused of beating eight people to death in August 2009. Seven of the victims were members of his family. All of them were found dead in the single-wide trailer they shared.
Dr. Arden said, "We have a very large number of victims in a single crime scene. And we have injuries that require immediate face-to-face infliction."
While blunt force trauma was the cause of death for each person, Arden testified that autopsies showed some of them had been stabbed and that more than one weapon, possibly a hammer, had been used.
Arden said, "This is indicative of multiple assailants, not just one."
That's something criminologist Michael Knox reiterated.
"This can't be done by one person," he said.
Knox talked about how bloody the crime scene was, and how Heinze barely had any blood on his clothes.
He said, "With as much blood spatter that's at the scene, nobody could have committed these crimes without having a significant amount of blood on them."
Knox also talked about something that hasn't been discussed much before. He said the victims were not drugged or incapacitated. And he said the evidence shows some of them fought back.
"There's multiple people that are at least actively trying to flee, without being restrained, or outright fighting with whoever's attacking them," he said.
Knox said Heinze would have had some injuries if he had been fighting. He didn't.
Testimony continues Wednesday.
Heinze faces the death penalty, if convicted.