First, Jennie Garth said goodbye.

Now, in far more unexpected casting news, Rob Estes is also out of 90210.

"Rob won’t be on the show next season,” a show insider told RadarOnline.com. "The producers, the studio and Rob came to the conclusion together that his role had ran its course. There just wasn’t enough for Rob to do because the show is more about the kids.”

That's true... but there must be more to this story. After all, Estes portrays the school principal and the father to two of the main characters. There are plenty of storylines in which he's been at least somewhat involved.

As you might expect, another source says the problem comes down to money.

“Rob’s an experienced actor and feels he deserves to be compensated accordingly," this source said. "But the CW just wants to cut costs and they want to reward all these young (and therefore cheaper) actors and actresses instead."

It's unclear at this time if Estes will be around when the series returns with new episodes on March 9. It sounds like writers will be scrambling to find a way to write him out for next season, but it won't be easy given his character's role on the show.

Will Harry and Deb get divorced? Will Harry get fired and move away? Might the series replace Estes with a different actor?

Sound off on this news in our comments section and/or in our 90210 forum!

** UPDATE: Estes will complete work on season two and then leave the show. He's released the following statement:

"This is my final season on "90210" and I wish the show, cast and crew nothing but the best. I am looking forward to spending time with my kids and exploring other opportunities."

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.