Hayden Panettiere was “lonely” and “struggling” on set of her final movie, according to her “Sleepwalker” co-star.

Justin Chatwin shared with People on Monday that Panettiere, who died on Sunday at 36, “seemed different when [he] met her [that] time than when [he] met her in the early years.”

The actor, 43, noted, “I’ve been sober for 15 years, so I know this world of addiction, and Hollywood — it takes, and it takes from youth.”

Chatwin recalled the Golden Globe nominee “open[ing] up to [him] about a lot of things” while working together on the 2025 project.

“She was authentic with me about her life and she opened up about her struggles with…

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