RIP: Donna Summer Dead: Queen Of Disco Dies At 63 (PHOTOS, VIDEO)

9:27 AM PST- TMZ has learned … Donna died from lung cancer.  Several sources are telling us Donna believed she contracted it by inhaling toxic particles after the 9/11 attack in New York City. 9:35 AM PST- Donna’s family just released a statement, claiming, they “are at peace celebrating her extraordinary