New details are emerging in the investigation into Hayden Panettiere’s death, with law enforcement sources reportedly focusing on a single pill that they believe may have been fatal.
Panettiere, 36, died on August 16 in Greenville, South Carolina, after she was found unresponsive at a residence. Her official cause of death has not yet been released, and toxicology results are still pending. An autopsy reportedly found no signs of trauma that contributed to her death.

According to multiple law enforcement sources cited by TMZ, investigators believe Panettiere may have taken one oxycodone pill containing fentanyl on the morning she died. The sources said she had reportedly obtained prescription drugs from a longtime drug dealer in Los Angeles before traveling to South Carolina.
Authorities are now working to determine where the suspected pill came from and whether anyone supplied it to Panettiere. The Drug Enforcement Administration is reportedly involved in the investigation and is examining the alleged connection between Panettiere and the person believed to have provided the drugs.

The reported theory has not been officially confirmed. Investigators are still waiting for the full toxicology results, which could provide a definitive answer about the substances in Panettiere’s system and her cause of death. One report noted that those results could take several more weeks.
Panettiere had spoken publicly about her long history with addiction. In her memoir, released just months before her death, she discussed her struggles with substance abuse and the efforts she made to seek treatment and rebuild her life.
Her death has since prompted a wider investigation involving both South Carolina and Los Angeles authorities. Police have not publicly identified a suspect in connection with her death, and her longtime boyfriend, Brian Hickerson, has not been named as a suspect.
For now, the single-pill theory remains an investigative lead rather than a confirmed official cause of death. The case is still developing as authorities await toxicology results and continue tracing the source of the suspected drugs.