( CNN ) -- A final autopsy report released Wednesday shows that Florida A & M University drum major Robert D. Champion suffered muscle damage commonly seen in such events as car accidents , prolonged seizures , child abuse and torture , an expert said . The alleged fatal beating suffered last month by Champion , 26 , during a marching band hazing must have been brutal , two experts said . `` His muscles were beaten so badly that they were destroyed like you would see in a heart attack , '' Dr. Howard Oliver , a forensic pathologist who is a former deputy medical examiner in the Los Angeles County Coroner 's Office , told CNN after reviewing the autopsy findings . Band bus a complex crime scene , expert says . The damaged muscles leaked out a protein called myoglobin , `` and it 's too much for the kidneys to process . It causes the kidneys to fail , '' which results in death , Oliver said . The muscle damage is called rhabdomyolysis , Oliver said . `` Most of the time it 's in ( car ) accidents or in people who freeze to death , and you get it in a lot of people who have prolonged seizures or in people who are in extreme physical activity like running in a marathon , '' Oliver said . `` You see it in torture or child abuse and severe burns when the muscles get damaged . '' In the case of seizures or freezing to death , people `` shiver and it really works the muscles over a long period of time , and it damages them , and they release the protein , '' Oliver said . Lawrence Kobilinsky , professor of forensic science at John Jay College of Criminal Justice in New York City , said the beating must have been severe . `` This kid took a real beating over his body , '' Kobilinsky told CNN after reviewing the autopsy report . `` They 're saying that the beating was so powerful , it just squashed the tissue . `` These are extremely forceful blows that this kid took , all over his back and his arms and his shoulders . It 's kind of like in Egypt where they beat up that poor woman yesterday , '' Kobilinsky said Wednesday . `` It 's interesting that there is no trauma to the neck or no trauma to the head . It 's interesting that they are avoiding those areas , '' Kobilinsky said of the people who delivered the beating . Added Oliver : `` They just pummeled him . '' Had they aimed for his abdomen , `` he would have bled to death . '' The autopsy was performed by Associate Medical Examiner Sara H. Irrgang of Florida 's District 9 Medical Examiner 's Office in Orlando , with oversight from Chief Medical Examiner Jan C. Garavaglia . That office serves Orange and Osceola counties . The complete autopsy report follows a press release issued last week by the medical examiner 's office that called Champion 's death a homicide . The medical examiners said in that statement that Champion died November 19 because of `` hemorrhagic shock '' -- the result of excessive internal bleeding -- `` due to soft tissue hemorrhage , due to blunt force trauma sustained during a hazing incident . '' Champion collapsed in Orlando on a bus carrying members of the Florida A & M Marching 100 band after a football game that included a halftime performance by the band . Christopher Chestnut , the lawyer for Champion 's family , has charged that Champion died after receiving `` some dramatic blows , perhaps ( having an ) elevated heart rate '' tied to `` a hazing ritual '' that took place on the bus . Some band members have said Champion died after taking part in a rite of passage called `` crossing Bus C. '' One member , who spoke on condition of anonymity , explained that students `` walk from the front of the bus to the back of the bus backward while the bus is full of other band members , and you get beaten until you get to the back . '' No one has been charged in Champion 's death ; the Orange County Sheriff 's Office is investigating the case . The medical examiner 's office said last week that Champion `` collapsed and died within an hour of a hazing incident during which he suffered multiple blunt trauma blows to his body . '' The autopsy conducted after his death found `` extensive contusions of his chest , arms , shoulder and back , '' as well as `` evidence of crushing of areas of subcutaneous fat '' -- which is the fatty tissue directly under a person 's skin . Champion did n't have any bone fractures or injuries to his internal organs . The medical examiner did n't find any evidence of `` natural disease except for a slightly enlarged heart , '' nor did toxicology tests reveal signs of drugs or alcohol .
Medical examiner releases complete autopsy report of FAMU 's Robert D. Champion . `` His muscles were beaten so badly that they were destroyed , '' an expert says . `` The beating was so powerful , it just squashed the tissue , '' another expert says .