For Verdi he wrote "Alzira" (1845), "La battaglia di Legnano" (1849) and "Luisa Miller" (1849). He had almost finished his libretto for "Il trovatore" (1853) when he died in July 1852. It was completed by Leone Emanuele Bardare. Cammarano started a libretto for William Shakespeare's "King Lear", named "Re Lear". He died before completing it. A scenario survives.