Star Peter Capaldi is departing BBC science-fiction series “Doctor Who.”

The move was announced via the show’s official Twitter account. The show tweeted Monday: “BREAKING NEWS! ‘It (the new series of Doctor Who) will be my last… I feel it’s time to move on.’ – Peter Capaldi”

Capaldi joined “Doctor Who” in 2014 for the series’ eighth season. The 10th season, which will be Capaldi’s last, is expected to premiere in the U.K. in April, and will debut in the U.S. later in the spring on BBC America.

Capaldi is the fourth actor to play the enigmatic hero of “Doctor Who”io since the BBC relaunched the series in 2005. He followed Christopher Eccleston, David Tennant, and Matt Smith. Capaldi had been rumored to be departing the show after the upcoming season. In leaving, he joins showrunner Steven Moffat, who had been with the series since 2010 and is being replaced by Chris Chibnall (“Broadchurch”).

“Doctor Who” follow the adventures of the Doctor, a member of an alien race of being called Timelords who travels through time and space in a Tardis, a vehicle shaped like a blue, telephone booth-like police-box. The character is recast every few season as part of a quirk in which the character dies, then is regenerated in a new body. Capaldi is the 12th actor to play the Doctor since his creation in 1963.