Actor Emile Hirsch, best known for his roles in films Into the Wild and Lone Survivor, is under investigation after he allegedly put a female movie executive in a “chokehold” at a Utah nightclub.

Hirsch was in Park City, Utah last week to promote his new film Ten Thousand Saints at 2015’s Sundance Film Festival when he attended an after party at Tao Nightclub on Sunday. At around 3:30 a.m. he reportedly became combative with Paramount executive Dani Bernfeld, a source told Page Six.

“Emile was aggressively picking on Dani,” the source said. That person also stated that Hirsch suddenly snapped and “He got even more aggressive and aggro. He pushed Dani up against a table, and then he put her in a headlock.”

Another source described Hirsch’s alleged incursion as a “chokehold,” and added, “He attacked her from behind — he completely blindsided her after he’d been s–t-talking and was already led away from her once.”

Nightclub security called police after being notified of the attack, and Hirsch reportedly calmly waited at the scene to discuss the incident with members of law enforcement. At around 5 am, he was released and went home with friends.

Capt. Phil Kirk of the Park City Police Department confirmed the incident is under investigation and said a county sheriff would decide if charges would be filed.

“We’ll be submitting the case to the Summit County Attorney’s Office for screening as soon as we complete the investigation,” Kirk said.