Some examples of bogus information from IMDB:
Carlos Bernard was listed until episode 5.22.
Kim was supposed to return in 5.09 or 5.10.
A "John Bauer" was supposed to appear in 5.16.
Thanks for keeping us straight!
I know what you're referring to, and Chase was listed as being in season 4. But this was on their news page, which has proven pretty reliable.