Hayden Panettiere died after taking an oxycodone pill laced with fentanyl, a new report has revealed. 

Sources told TMZ the 36-year-old actress had a “long time drug dealer” in Los Angeles, and this person was providing Panettiere with several “black market prescription drugs”.

Hayden Panettiere, Critics' Choice Awards, 2016, Santa Monica, California.

New details surrounding the death of actress Hayden Panettiere have been revealed, with law enforcement reportedly believing she took a pill laced with fentanyl on the day she died.  Getty

The outlet said Panettiere brought drugs with her from Los Angeles to South Carolina in August, and she consumed the laced pill on the morning she died. 

According to TMZ, the DEA (Drug Enforcement Administration) in Los Angeles is actively piecing together the relationship between Panettiere and her drug dealer, attempting to trace the fatal pill back to him.

Any further action will depend on Panettiere’s toxicology results. 

“The investigation is still ongoing. Law enforcement has not disclosed who they are targeting, but I am told the case is complex. We hope to have more answers soon,” a representative for Panettiere told Page Six in a statement.

Panettiere died in South Carolina on Sunday, August 16 (Monday, August 17 AEST) and her on and off again boyfriend Brian Hickerson was with her at the time, along with his brother Zach Hickerson.

More details which were released in the days after her sudden death from authorities claimed that Zach was “very emotional” as paramedics worked on her. 

Hayden Panettiere, Brian Hickerson, January 31, 2019, Los Angeles, California

Hayden Panettiere’s ex-boyfriend Brian Hickerson was with her on the day she died.  Getty

A heavily redacted report from the Greenville Police Department, obtained by Page Six, said Zach referred to Panettiere as his “brother’s girlfriend” at the scene. 

According to responding officer Matthew Bryan, Brian “did not become emotional” until Panettiere was officially declared dead. 

Brian also handed over a “bag of medication” the actress had in her possession at the time of her death. 

The names of the medications have been redacted in the report, although nine were listed according to the outlet. 

Audio of the 911-emergency call, published by multiple US outlets including TMZ, revealed paramedics were called to the property over reports of an “overdose”.

Audio of the 911 call revealed paramedics were called to the South Carolina property over reports of an overdose.  Evan Agostini/Invision/AP

A dispatcher in the audio can be heard referring to an “unidentified female” in “cardiac arrest” and within minutes “CPR [was] in progress”.

TMZ also reported that Narcan, a nasal spray which is used to reverse the effects of an opioid overdose, was found in the apartment where she died.

The National Alcohol and Other Drug hotline (1800 250 015) provides free and confidential advice about alcohol and other drugs, including available treatment options, and automatically directs the caller to the Alcohol and Drug Information Service in their state/territory.