Police is Greenville, South Carolina, are reportedly conducting a death investigation following the shocking death of actress Hayden Panettiere.

According to TMZ, “police are not satisfied Hayden Panettiere’s death was a tragic overdose of prescribed meds.”

Parade has reached out to the Greenville Police Department for further comment.

This new information comes on the heels of reports that two Greenville police officers showed up at the family home of Panettiere’s boyfriend, Brian Hickerson, and his brother, Zach Hickerson, on Wednesday morning. According to Page Six, the officers knocked on the doors of the home, but no one answered. They returned about an hour later for a “welfare check,” but no one answered. The outlet was able to confirm that Zach was home at the time.

“Hayden’s death was unexpected. She was only 36,” a law enforcement source told TMZ.

The Greenville Police Department shared an update on the investigation on its website on Monday, Aug. 17.

“The case is under investigation by the Greenville Police Department in conjunction with the Greenville County Coroner’s Office,” the update reads, in part. “The preliminary investigation has not indicated any signs of foul play or suspicious circumstances. An acquaintance of Ms. Panettiere placed the 911 call. At this time, no further details are available for release.”

Panettiere was found unresponsive inside an apartment in Greenville on Sunday, Aug. 16. Authorities have confirmed that both Brian and Zach were at the apartment with the Heroes star when she died. Shortly after her death, an autopsy was conducted.

“No signs of trauma were discovered that would have contributed to the death,” read a statement by coroner Mike Ellis following Panettiere’s autopsy (via People). “The cause and manner of death remain pending further investigation and the completion of additional studies. This investigation remains active and ongoing. No further details are available for release at this time.”

A toxicology report is still pending.