>>116712702There's a handful of scenes, but you get most things from context. Only two important thing are:
-after Dead Girl Walking Veronica tries to apologize to Heather by making her a hangover cure. She and JD joke about poisoning her and JD "accidentally" slips Heather the poison
-after Veronica saves Hewather DUke from comitting suicide, JD suggests killing Heather Macnamara, which causes Veronica to break up with him