Hayden Panettiere's ex-boyfriend Brian Hickerson was at the scene when she died: Police

Hayden Panettiere's ex-boyfriend, Brian Hickerson, was present at the scene when she died, according to a police report obtained by ABC News.

Hickerson and his brother Zach were present at the South Carolina apartment at the time of the actress' death, according to a police report from Greenville, South Carolina.

Hickerson showed the officer "a bag of medication" that Panettiere was allegedly on, the report indicated.

First responders found the actress in cardiac arrest at that apartment Sunday afternoon. She was pronounced dead roughly 40 mins later.

In the police report from the Greenville City Police Department, an officer arrived on the scene on Easley Bridge Road in Greenville. The officer was responding to an EMS assist for an individual who was unresponsive.

"The patient did not seem to have any obvious physical reasons to be unresponsive," the officer wrote in the report.

"EMS attempted to perform life saving methods for an extended amount of time before they called a time of death. This was 1431 hours," the report continued.

The officer then wrote in the report that they spoke with Brian Hickerson and his brother, Zach Hickerson, who was also on scene, while EMS "was working on the patient."

Zach Hickerson described Panettiere as his brother's girlfriend.

"I observed Zach to be very emotional while EMS were working on Hayden," the officer wrote. "Brian did not become emotional until EMS declared her officially deceased. Medic 24 and S4 were on scene performing life saving measures."

The officer added in the report that Brian Hickerson showed them the bag of medication that Panettiere was taking.

An autopsy, which was completed on Monday, found no signs of trauma, and a cause of death is still undetermined.

Panettiere was known for her roles in "Heroes," "Nashville," "Remember the Titans" and more. She was 36 years old and would have turned 37 this Friday.

Panettiere had been open about her battles with substance abuse and postpartum depression.

Her death came just days after an L.A. County judge denied Hickerson's attempts to dismiss and reduce his past felony  domestic violence charges involving Panettiere.

Meanwhile, as the memorial outside the South Carolina apartment continues to grow, Panettiere's ex-fiance - the father of her daughter Kaya - paid tribute to his former partner.

Former boxer Wladimir Klitschko posted a photo of the trio on social media, saying, in part, "To our daughter Kaya, I will always speak of her mother with respect and make sure she remembers the person she was."

ABC News' Angeline Jane Bernabe contributed to this story.