For example, Lisa Nicole Carson essentially got dumped from Ally McBeal because she was bi-polar. Kristy McNichol left Empty Nest to concentrate on her mental well-being, only returning for the series finale. Michael O'Hare had to leave Babylon 5 after the first season because he started having psychotic symptoms (which turned out to be schizophrenic) that were bad enough for everyone else to take notice of.

Considering the way actors behave not as common as it should be.

I was going to mention Michael O'Hare if you hadn't. I just recently started watching Babylon 5 on Amazon and I'm mostly enjoying it. Just started the second season a couple days ago where Bruce Boxleitner replaced O'Hare. The stories are mostly good and the acting's great but I think a lot of the special effects are sub-standard. I looked up a lot of the actors online so that's how I found out about O'Hare's mental illness beginning in the first season and that it caused him to have to leave the show.

Ed.

I was going to mention Michael O'Hare if you hadn't. I just recently started watching Babylon 5 on Amazon and I'm mostly enjoying it. Just started the second season a couple days ago where Bruce Boxleitner replaced O'Hare. The stories are mostly good and the acting's great but I think a lot of the special effects are sub-standard. I looked up a lot of the actors online so that's how I found out about O'Hare's mental illness beginning in the first season and that it caused him to have to leave the show.

Ed.

J. Michael Straczynski (https://www.syfy.com/syfywire/straczynski-reveals-moving-story-why-michael-ohare-left-babylon-5) on Michael O'Hare's (https://gazettereview.com/2017/12/what-happened-to-michael-ohare/) battle with mental illness - EMMYTVLEGENDS.ORG

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I believe Grace Under Fire ended in part, due to Brett Butler's erractic behavior on set. I also wanna say that the parents of the actor who originally played her son pulled him from the show as a result.

I believe Grace Under Fire ended in part, due to Brett Butler's erractic behavior on set. I also wanna say that the parents of the actor who originally played her son pulled him from the show as a result.

Yes. Apparently, Brett was drunk and flashed in front of the boy who originally played Quentin. That and her behavior resulted in the character being aged up and replaced by a teenager.