Former Chilean President Sebastian Pinera died from asphyxiation due to submersion after the helicopter he was piloting crashed into a lake in southern Chile on Tuesday, the local prosecutor's office reported on Wednesday. Chile's Legal Medical Service, the state coroner's office, in the southern city of Valdivia conducted an autopsy overnight on Pinera, who died at the age of 74, before his remains were sent to receive state honors in the Chilean capital on Wednesday. "As the prosecutor's office, we are now in a position to be able to inform the community that the medical-legal cause of the death of former President Sebastian Pinera is asphyxiation due to submersion," Tatiana Esquivel, the local prosecutor where the accident happened, told reporters.