Today in Hollywood Harassment: Jon Stewart Reacts to Louis C.K., 'One Tree Hill' Stars Accuse Showrunner

"The Flash" star Grant Gustin joined his voice in solidarity with his "Arrowverse" colleagues over allegations against executive producer Andrew Kreisberg. Meanwhile, the cast and crew of "One Tree Hill," which ended its CW run in 2012, came together to pen a letter alleging multiple instances of inappropriate behavior from their showrunner Mark Schwahn, while another accuser is seeking legal action against Tom Sizemore for an incident she said occurred when she was 11 years old.

Here's the latest:

Jon Stewart Reacts

For the first time since his long-time friend Louis C.K. admitted to allegations of sexual misconduct with five different women, Stewart spoke up, saying he felt angry and stunned on the "Today" show Tuesday morning. "You always find yourself back to a moment of, 'Did I miss something? Could I have done more?'" Stewart said. "And in this situation, I think we all could have. So you feel anger at what you did to people."

He went on to add, "It's another one of those endemic, systemic and complex problems that we all haven't had the urgency for, certainly myself included." The comedian said he hasn't spoken to C.K. since news of the allegations broke.

Pamela Adlon Drops C.K.'s Former Manager

Co-creator and star of "Better Things," Pamela Adlon has dropped Dave Becky as her manager in the wake of the Louis C.K. scandal, Deadline reported. Becky was C.K.'s longtime manager until Friday, when the comedian was fired from 3 Arts Entertainment and FX severed ties with him. Adlon co-created "Better Things" with C.K., who also served as an executive producer on the critically acclaimed series.

Claiming he thought C.K.'s indiscretions were consensual infidelity, Becky told The New York Times, "I now comprehend that my response was perceived as a threat to cover up sexual misconduct. This is not an excuse. What I did was wrong, and again, I am extremely sorry."

"I Love You, Daddy" Dropped

International distributors followed US distributor The Orchard's lead, dropping Louis C.K.'s new film in the wake of the allegations brought against him. "It's impossible today to watch the film and appreciate the jokes without taking into consideration what just happened, because Louis C.K. put all of himself in every joke," said France's ARP Selection co-founder Michèle Halberstadt.

The film has also been dropped in the Middle East and North Africa, according to Variety. "This is the type of message we need to send to the whole system, which needs to reexamine its core ethical and professional values," said the Middle East's Front Row Filmed Entertainment.

In a show of solidarity, cast and crew members of former CW show "One Tree Hill" have come forward with allegations of sexual misconduct against showrunner Mark Schwahn. Audrey Wauchope, a writer on the show, was the first to come forward Saturday in a series of tweets that detailed extensive sexual misconduct on the set. She did not name Schwahn in particular, but did say that it was the showrunner working when she was a writer there.

In response to her story, 18 women who worked on the show -- including stars Hilarie Burton, Sophie Bush, and Bethany Joy Lenz -- signed a letter to stand together against the treatment they allegedly endured. "Many of us were put in uncomfortable positions and had to swiftly learn to fight back, sometimes physically, because it was made clear to us that the supervisors in the room were not the protectors they were supposed to be," the letter said.

In a joint statement, the production companies behind Schwahn's current show "The Royals" wrote, "We are monitoring the information carefully. E!, Universal Cable Productions and Lionsgate Television are committed to providing a safe working environment in which everyone is treated respectfully and professionally."

The complete letter was posted on Variety.

Actor Tom Sizemore was allegedly removed from a film set in 2003 after assaulting a minor, according to The Hollywood Reporter. The actor purportedly returned to the set of "Born Killers" for re-shoots after the family declined to press charges.

The now 26-year-old former actress told THR that she has hired a lawyer to explore legal action against both the actor and her parents. A dozen people report that Sizemore was sent home after the girl told her parents that he touched her genitals during a scene in which she sat on his lap.

Sizemore is reported to have denied the allegations at the time. His management firm reportedly dropped him shortly afterward. When reached for comment now about the story by The Hollywood Reporter, a rep for Sizemore said "no comment."

Following shortly on the heels of "Arrow" star Stephen Amell's statement of support for his CW colleagues, "The Flash" star brought forth a statement of his own on Instagram. "These last few weeks I haven't been sure what to say, so let me just say this," Gustin wrote. "I want to be [a] better man, a better ally. And I especially want all the women in my life to know that I hear them, I stand with them, and I support them."

Andrew Kreisberg, who is a co-creator and EP for shows including "Supergirl," "Arrow," "The Flash" and "DC's Legends of Tomorrow," was suspended following allegations of sexual harassment from more than a dozen CW employees. Warner Bros. is conducting an internal investigation.

Gustin's complete statement follows: