Police have finished an autopsy on the remains of Ronald Espinosa, the town mayor of Albuera, Leyte who was shot and killed inside his cell at at the Baybay City Provincial Jail on Saturday.

Police Chief Inspector Benjamin Lara, medico-legal of SOCO Regional Office 7, said a bullet was recovered from the mayor's body.

He refused to grant an interview to media after the autopsy.

Espinosa's remains are set to be brought to Sitio Tinago, Barangay Benolho in Albuera town later Sunday.

Espinosa, mayor of Albuera town in central Leyte province, was shot dead by police 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