Rolando Espinosa Sr., the mayor of Albuera, Leyte, was shot at least four times, with one bullet piercing through his body, autopsy results revealed Sunday. The autopsy also revealed the mayor could have been lying down when he was shot.

Lailano Villarino, lawyer of the Espinosa family, said the mayor sustained four gunshot wounds according to the autopsy conducted by Police Chief Inspector Benjamin Lara, medico legal of SOCO Region 7.

Three deformed bullets were recovered from the mayor's body. The fourth bullet, however, went through his corpse.

The autopsy showed Espinosa sustained a head wound.

The results said there is a possibility that the mayor was lying down when he was shot, Villarino said.

Two of the mayor's pricey rings were also reported missing.

The fired bullets are set to be brought to the regional crime laboratory for further study.

The mayor's remains are set to be brought to Sitio Tinago, Barangay Benolho in Albuera town for the wake. He will be brought to the house of Albuera's son, suspected drug lord Kerwin Espinosa.

The Espinosa family said they will seek help from the National Bureau of Investigation and Commission on Human Rights to investigate the killings.

Espinosa was among the politicians linked by President Rodrigo Duterte to the illegal drug trade.

He surrendered to police in August after saying that he feared for his life amid the government's intensified campaign against illegal drugs.

His son, Kerwin, who was considered as one of the biggest drug lords in the Visayas, was nabbed in Abu Dhabi in October.

On Saturday, the mayor was shot dead after he and fellow slain inmate Raul Yap allegedly fired shots at operatives of the PNP's Criminal Investigation and Detection Group (CIDG) Region 8 who were serving a search warrant at the Baybay Provincial Jail.

Philippine National Police chief Ronald "Bato" dela Rosa has ordered an investigation into Espinosa's death, promising that there would be no cover-up in the process.

He said one of the angles that he is looking into is the alleged blue book that Espinosa's son, Kerwin, is holding.

The book allegedly contains names of police officials involved in the protection of the illegal drug trade.

A hard drive containing video footage of what may have transpired during the shooting incident which led to the death of Espinosa is missing, Leyte provincial administrator Edgardo Cordeño said.

• READ: CCTV footage of Albuera mayor's death missing