Pamela Nascimento, 27, appeared as the glamorous assistant host on several prime-time game shows.
She is believed to have died on the operating table after suffering a perforated kidney during the cosmetic surgery at the private clinic in Sao Paulo, where she lived.
The cause of her death was registered as hypovolemic shock, where severe blood loss makes the heart unable to pump enough blood to the body.
It was reportedly the third time the model had undergone the stomach-flattening procedure.
Police today said they will be exhuming her body and could charge the surgeon who performed the operation, Dr Julio Yoshimura, with manslaughter.
The doctor could also be charged with procedural fraud as the police were not notified about the death, and her death certificate written by the same doctor who had performed the operation, a spokesman added.