The comedian, who has been part of the Saturday Night Live cast for the past three seasons, has announced he will not return for the upcoming season 51.
"me and baby broke up," Walker captioned an Instagram carousel announcing the decision.
His former SNL castmate Chloe Fineman commented on Walker's post, "I'll miss being your pregnant wife all the time!!!!!"
Previous SNL cast members Taran Killam and Jay Pharoah also sent support Walker's way.
Walker joined SNL as a featured player in 2022. He was promoted ahead of the 50th season of the show last year.