Well everybody didn't like Keppler as well as the viewers
As they missed Grissom a lot. But now, his past
Was unveiled and also everybody thought that he was a dirty cop. He was a very creepy but still, now you appreciate that very much from him. This hasn't been Catherine's year as not just her own team very much nearly turned on her but Keppler died while protecting her. He wasn't a dirty cop after all. Though the viewers and the people working around him thought that he was. And oh, welcome back Grissom!