Seeking to bolster its Thursday-night Nielsen numbers, NBC announced Monday that it is cancelling the highly rated CBS drama CSI: Crime Scene Investigation. 'CSI was a quality show that, unfortunately, always quite lived up to expectations,' said Jeff Zucker, NBC president of entertainment. 'We tried to give it plenty of time to lose an audience, but in the end, it just was working.' Other shows NBC may cancel include Fox's American Idol, ABC's Alias, and CBS's Everybody Loves Raymond. 