Criminal Minds fans who are disappointed to not see Emily Prentiss return to fill one of the BAU’s vacancies can blame John Stamos’ surprise brush with grandfatherhood.

Appearing Thursday at the Television Critics Association press tour in Beverly Hills, where she was promoting the new Fox comedy Grandfathered, Paget Brewster revealed that she was interested in putting in another Criminal Minds encore, but scheduling conflicts proved insurmountable.

“I was hoping to jump in and do a couple [of Criminal Minds episodes], because my friend A.J. Cook, who plays JJ, is [finishing maternity leave],” Brewster shared. “But it didn’t work out, time-wise,” due to her commitment to Grandfathered (where she plays Stamos’ baby momma and thus a grandmother).

Brewster elaborated on the situation for TVLine, saying: “A.J. called me and I said, ‘I think so, if we aren’t doing Grandfathered‘ — at the time, I didn’t know if we were picked up [by Fox] — and it just didn’t work out, which was too bad because I love those guys. I love the writers, I’m still friends with everyone there…. But it just didn’t work out, which was a shame. I really wanted to do it!”

CBS’ Criminal Minds had two agents to replace entering Season 11, with the aforementioned Cook (who gave birth in late July) wrapping her maternity leave and Jennifer Love Hewitt having vacated the role of Kate Callahan in the spring, after one season.

Thus far, Aisha Tyler has been cast in a recurring role of as Dr. Tara Lewis, a forensic psychologist who is determined by Hotch to be the best candidate for Kate’s position.

Brewster wrapped her full-time Criminal Minds run at the close of Season 7, then popped up in the middle of Season 9 for the drama’s 200th episode.