No no, this is just made up... haha.
However... MJ was killed off in the comics, but after a negative fan-base reaction, brought back.
Taken from:
http://en.wikipedia.org/wiki/Mary_Jane_WatsonIn the mid-1990s, Marvel's editors decided to take drastic measures to undo the marriage between Peter and Mary Jane. The end result was the controversial "Clone Saga", which intended to negate the marriage by revealing that Mary Jane was in fact married to a clone of the real Peter Parker. When this failed, Marvel responded by controversially turning Mary Jane into an unloving bitch-type character who was constantly demanding Peter give up being Spider-Man and who was obsessed with being young and beautiful. Restarting her career as a model, Mary Jane was killed off in an airplane explosion that was done specifically to kill the character off for good and permanently free Spider-Man from being married.
Ultimately, J. Michael Straczynski would bring Mary Jane back, granted several issues earlier than promised. During his second year as writer of Amazing Spider-Man, Mary Jane returned and ultimately reconciled with her husband in the book's 50th issue. Mary Jane and Aunt May then moved into Avengers Tower, to accompany Peter when he took on the duties of an Avenger.