Doctors said that Chandru Gawas, 33, died of multiple organ failure.
North Goa Superintendent of Police Arvind Gawas told reporters that a case of unnatural death has been registered at Panaji police station.
"We will carry out an investigation to probe what led him to commit suicide," the officer said.
Special Judicial Magistrate (SJM) Maria Mascarenhas, on Monday recorded his dying declaration wherein he allegedly named three senior officers of Crime Branch. He reportedly alleged that the officers would constantly harass him for work.