Gregory Itzin, the star of "24" and "Twin Peaks," tragically died. He was 74.

The producer and director of Itzin's "24," where he played the role of a Nixonian president, revealed the news on Twitter.

According to director Jon Cassar, the "24" family would miss the actor. He also paid tribute to him but did not disclose Gregory Itzin's cause of death.

"He was one of the most talented actors I had the honor to work with, but more than that he was an all-around great guy. He'll be missed by his 24 family who had nothing but love & respect for him," he said.

A representative for the actor eventually confirmed the news to The Hollywood Reporter, saying that he died on Friday while undergoing emergency surgery. Itzin reportedly suffered from complications during the procedure.

It remains unknown what exact procedure he tried to receive. But it was reported over a decade ago that the "Mentalist" actor had been battling ulcerative colitis. This led him to have a radio public service announcement (PSA) series on behalf of the Crohn's & Colitis Foundation.

Through the PSA, he aimed to have Americans register for one of over 100 Take Step Walks to raise awareness for the diseases.

"Fortunately I have this disease under control with a combination of diet and diligence, but there are so many Crohn's disease and ulcerative colitis patients out there suffering every day," he said at that time, per PR Newswire.

According to NHS, Itzin's disease is a long-term condition where the colon and rectum become inflamed. The ulcers that develop on the organ's lining can bleed and produce pus.

In 2015, he suffered a heart attack while performing Shakespeare's Falstaff on stage but continued working after his recovery.

His family and representatives are yet to confirm whether either of these is connected to his recent surgery.

Gregory Itzin's Career

The Washington, D.C. native first studied acting at the American Conservatory Theater in San Francisco. He officially began his career through an uncredited on-screen role in the 1979 miniseries, "Backstairs at the White House."

Itzin also played the role of "Religious Zealot #1" in the 1980's "Airplane!"

The actor continuously tried his luck until he landed notable roles in different flicks, including "Hill Street Blues," "Charlie's Angels," "Party of Five," "Murder One," and "NYPD Blue." He also appeared in the three "Star Trek" series.

Itzin also became part of "Friends," "The Mentalist," "Law Abiding Citizen," and "The Fabulous Baker Boys."

His most recent TV role before his death was a 2020 guest appearance on "NCIS."