When they changed their behavior it changed the future. The future in most of the si-fi and fantasy genre is constantly changing due to actions of people in the present. Also the writers only killed Prue off because the actress didn't want to do the show and was giving everyone trouble.
Prue dies at the end of the 3rd season of Charmed.
She was killed in series 3 but unfortunately didn't return.
Demon Shax killed her.
no
no :(
no.
okay, first thing. her name is PRUE. and PRUE died in the last episode of the third season.
Yes, but she is called Patience, since Prue actually took over some witch body. However this Charmed season 9 is only a comic book and it won't be filmed as tv-series in the future. You should google more if you're interested.
I'm not sure that she did come back in the ninth season (its a comic book). The only Prue that is mentioned is Phoebe's Daughter, Prue Jr. If you would like to read more go on charmed wikia :)
She was killed in the last episode of the third season "All Hell Breaks Lose". She was killed by a demon after time was reversed by Tempest (another demon).
Prue and Zile got married in the Charmed season 3 episode 'Bride and Gloom'.
season 2 episode 9