My Great grandfather arrived in Puerto Rico in 1939 (?).His name was Jules Jean Joseph Olivieri Perreymond, known as Julio Olivieri or Oliviery in PR. After 1886 he disappears from birth records of descendants. He lived in Mayaguez and Las Marias. His spouse (married?) was Ysabel Monsanto from Curacao. She died in 1907. Why can't I find his Death Certificate in Puerto Rican Records?