Hours after HBO renewed Silicon Valley for a fifth season, the network revealed a major cast shake-up for the next season. T.J. Miller, who played the egomaniac Erlich Bachman since the show's first season, is leaving the series, HBO revealed to The Hollywood Reporter

"The producers of Silicon Valley and T.J. Miller have mutually agreed that T.J. will not return for season 5," the network said in a statement to THR. "In Erlich Bachman, T.J. has brought to life an unforgettable character, and while his presence on the show will be missed, we appreciate his contribution and look forward to future collaborations."

Created by Mike Judge and Alec Berg, the series has been a critical hit since its debut in 2014, and even won two Emmy awards. Currently, Silicon Valley is halfway through the show's fourth season run. The rest of the show's ensemble cast, made up of Thomas Middleditch, Zach Woods, Kumail Nanjiani, Martin Starr, Josh Brener, Amanda Crew, Matt Ross, Jimmy O. Yang and Suzanne Cryer, are all expected to return.

Miller became one of the early breakouts on the show, earning a Critics' Choice Award for the role in 2015. His role as the supremely arrogant entrepreneur who administers the Hacker Hostel, where the Pied Piper crew live and work in exchange for 10 percent of their potential businesses, made Miller one of the most pivotal and comedic characters on the show.

Neither HBO nor Miller has given any details about the reason for the departure. However, just looking at Miller's increasing busy schedule, it may be the reason why he's leaving. Since Silicon Valley's debut, Miller's career has skyrocketed.

In 2016, the actor played Ryan Reynolds' best friend, Jack Hammer / Weasel in the R-rated superhero film Deadpool. Miller will reprise his role in the sequel, due out in 2018. He also starred in the holiday film Office Christmas Party, opposite Jason Bateman and Jennifer Aniston. 

Miller currently stars on Comedy Central's The Gorburger Show, serving as an executive producer and voicing a giant blue monster who took over a Japanese television station. He also voices the lead character in The Emoji Movie, which hits theaters this summer. He’s recently wrapped filming the thriller Underwater, and shot a role in Steven Spielberg’s film adaptation of the novel Ready Player One. Miller's also signed on to the Western film Walden and How to Train Your Dragon 3. In addition,  Miller's first standup special, Meticulously Ridiculous, will premiere on all of HBO's platforms on June 17.