Mielr said:

bkev said:
Didn't Alec Guinness convince Lucas to kill off Obi-Wan because he couldn't stand the dialogue? I remember reading that SOMEWHERE...

I heard the exact opposite- that Guinness was so upset that the script was changed and his character was being killed off that he nearly quit the film. Lucas had to talk him down and explain the reasons that Ben's death would benefit the film, and he finally convinced Guinness to go on.

This is what that awesome Making of Star Wars released recently said.