Conversation so far:
who are the main characters on criminal minds
The main characters of Criminal Minds are Dr. Spencer Reid, Jennifer Jareau, Penelope Garcia, Emily Prentiss, David Rossi, Dr. Tara Lewis, Luke Alvez, and Matt Simmons.
who are the former main characters in criminal minds
The former main characters of Criminal Minds are Jason Gideon, Elle Greenaway, Ashley Seaver, Dr. Alex Blake, Kate Callahan, Derek Morgan, Aaron Hotchner, and Stephen Walker

Question: how was jason written out of the show
Self-contained rewrite: how was jason gideon written out of criminal minds