The Drug Enforcement Administration joined the investigation into Hayden Panettiere’s death, according to ABC News.

The DEA is entering a joint effort with South Carolina’s Greenville Police Department and the local coroner’s office, according to TMZ.

Panettiere died Sunday night at age 36. Her cause of death is currently unknown. In her 2026 memoir “This Is Me: A Reckoning,” Panettiere went into detail about her years-long struggles with drug and alcohol addiction.

After news broke of Panettiere’s death, tributes from across Hollywood came pouring in online. On Wednesday, Jack Coleman, who played her father on “Heroes,” shared an emotional tribute on Instagram.

“I’m heartbroken. I couldn’t begin to put my thoughts into words until now, and they will be inadequate,” Coleman wrote. “I’ve loved Hayden since day one of the pilot of ‘Heroes,’ 20 years ago, when she introduced herself by shouting ‘daddy’ and throwing her arms around me. From that day on, she called me daddio. She was Haydini, because she was a magician.”