La Stilla

Italian prima donna pera singer from the 1892 novel Le Château des Carpathes (The Carpathian Castle)] by author Jules Verne, better known for his pioneering sci-fi than this gothic-y, romantic-type stuff.

Freaked out by a stalker who goes to all her shows (Baron de Gortz), she accepts a marriage proposal of Romanian Count Franz de Telek, but dies onstage. Later at the Baron's creepy castle, Telek thinks he hears her singing.