70-year-old man who died suddenly has the finding shown here on external examination at autopsy. Which of the following is the most likely diagnosis?

This is a contact range gunshot wound with sooting to produce the central dark discolouration. The star-shaped lacerations result from gases from the gunshot causing laceration to the skin over the skull. Ref : Krishnan vij Textbook of Forensic medicine and Toxicology 5th edtion ; 197 ,248