N Dhamendran's post-mortem report reveals multiple blunt force trauma was the cause of death, said Padang Serai MP N Surendran on Saturday.
Injuries found included staple wounds and bruises on the front and back of the body and legs.
Surendran, who is also PKR vice-president, demanded that Prime Minister Datuk Seri Najib Razak respond personally to explain why Dhamendran was beaten to death, and for the police personnel involved be immediately charged with murder.