The family of a researcher has issued a letter of demand to a public hospital, seeking clarity from the management as to why the father, who was admitted for a tumour removal operation, ended up dying from Covid-19.

The family's lawyer Wan Azmir Wan Majid claimed that Mohd Rum Anuar, a 70-year-old researcher with the Malaysian Agricultural Research and Development Institute (Mardi) tested negative for Covid-19 upon admission to the hospital on May 5.

He said Rum became...