It is known for sure if the victim alive when pushed into the woodchipper?
ETA: Looks like he probably was, but I didn't know if an autopsy was even possible to confirm due to state of body.
"Mr Cummings told the jurors they would hear from Peter John Koenig, who would tell them he was the only person to see Roser hit Mr Saunders from behind with a 40-millimetre metal pipe and then repeatedly strike the victim's head while he was on the ground.
"Mr Cummings said Mr Koenig would say he joined Roser in carrying Mr Saunders' lifeless body to a large woodchipper and partially lower his body into the machinery to make it look like he had a fatal accident while clearing trees to help a recent widow sell her land."