No deal to have the actor in the film had been brokered
Bloody-Disgusting reports that Brian Cox (X2: X-Men United) is not going to be in Scream 4 as had been reported.

According to the site no deal for the actor had been brokered.

The horror series that reignited the genre and grossed more than $500 Million worldwide is back! From Kevin Williamson, creator of the original Scream trilogy, the new film sees the return of cast members Neve Campbell, Courteney Cox and David Arquette, along with a group of new stars, who can hopefully stay alive long enough to figure out the new rules to this one-of-a-kind horror franchise.

Scream 4 will be released by Dimension Films.