Adam Marcus claimed Val Kilmer was the “worst human being” a year after the actor died from pneumonia.

The director, who worked with the late “Batman Forever” star in the 2008 action thriller “Conspiracy,” took to Facebook over the weekend to call out Kilmer.

“#MicroIntellectMonday to that time when I directed that guy. The guy who played Iceman and Doc Holiday [sic]. You know the one,” Marcus wrote alongside a photo of himself and Kilmer.

“Here’s me and the Putz working it out on the set of ‘Conspiracy,'” Marcus, 58, added.

The filmmaker then addressed fans who were upset at his negative comments about the late “Top Gun” star.

“And to any of you rolling your eyes because of the whole ‘don’t speak ill of the dead bulls–t’, f–k that,” he reportedly wrote and later deleted.

Marcus added that if Kilmer “did one-tenth of what he did on my set today, he would have been cancelled in a blink.”

“Worst human being I’ve ever known … and that is really saying something,” he concluded.

While exclusively speaking to Page Six, Marcus clarified that he didn’t “wish death” on Kilmer, but said he was a “bully” during their time working together.

“I hate what happened to Val — as far as his illness and the tragedy of what happened. This is awful. I don’t wish that on anybody. No matter how much I dislike somebody, it doesn’t mean that I want them to be in pain or suffer in any way possible,” he shared.

However, Marcus said Kilmer’s death shouldn’t excuse his alleged behavior, which included being constantly tardy to set.

“He would come to set three to six hours late, although he was paid millions for his role,” Marcus told us.

Page Six has reached out to Kilmer’s estate for comment but did not hear back.

Kilmer played William “Spooky” MacPherson, a disabled special operations Marine wounded during combat operations in Iraq, in Marcus’ film.

When MacPherson goes to the Southwest to visit a friend, he discovers that his pal has disappeared, and no one acknowledges that the person ever lived there.

Kilmer has been called difficult to work with before.

In a 1996 interview with Entertainment Weekly, “Batman Forever” director Joel Schumacher said Kilmer was “childish and impossible” and a “psychologically disturbed human being.”

The “Island of Dr. Moreau” director John Frankenheimer vowed never to work with Kilmer again after the 1996 horror film.

In a 2021 documentary about Kilmer’s life, the “Heat” actor addressed the claims about his on-set behavior.

“I have behaved poorly. I have behaved bravely. I have behaved bizarrely to some,” he says in the doc. “I deny none of this and have no regrets, because I have lost and found parts of myself that I never knew existed. And I am blessed.”

Kilmer died at his home in Los Angeles in April 2025 from pneumonia. He was 65.

The “Tombstone” star was reportedly bedridden years before his passing, due to a lack of energy from his past cancer treatment.