Daniel Cosgrove is out and Colin Egglesfield is in.

As previously reported, the former actor was slated to appear on a future Brothers & Sisters flashback episode, taking on the role of a young William Walker.

But sources tell E! News that the soap opera star has been replaced by Egglesfield, whose run on Melrose Place is about to come to an end.

Airing this spring, the special, two-part episode will take viewers back to 1973 and 1986. We'll meet a number of main characters in their youth, each played by different, younger actors than usual. Confirmed so far:

• Kay Panabaker as Kitty
• Anna Wood as Sarah
• Kasey Campbell as Kevin
• Cody Longo as Tommy

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