The authorities exhumed the mortal remains of an elderly Catholic nun, who was buried in a Cathedral Church cemetery in Pala in April and performed an autopsy to ascertain whether she was killed by an alleged ‘psychopath killer’ who was arrested recently in connection with the murder of another nun. The man held in connection with murder of a 69-year-old nun in Pala had confessed during interrogation that he had attacked 83-year-old Sister Jose Maria, another nun, at her convent near Erattupetta in April this year, police said.