The autopsy detailing the death of Trey Zwicker states the murdered teen died from "multiple injuries sustained in an assault," with "findings consistent with chop injuries to the back of [the] head."
Medical Examiner Amy Burrows-Beckham found that Zwicker had both blunt force and sharp force wounds. That leads Joseph Scott Morgan, a former medical examiner investigator, to believe that two different weapons were used to kill Zwicker.
Convicted murdered Josh Gouker said he alone beat Zwicker to death with a pipe. But prosecutors are trying Gouker's son Josh Young -- Zwicker's stepbrother -- on charges of complicity to murder and complicity to tampering with evidence.
Morgan uses diagrams from the autopsy report to show us why he thinks there was more than one weapon.