Hayden Panettiere's final PETA campaign captured weeks before her death marked lifetime of advocacy work

Hayden Panettiere was remembered as more than just an actress in her final campaign with PETA, a project that was captured in Los Angeles weeks before her sudden death at 36.

In an image shared earlier this week, Panettiere posed from a bathtub to protest marine parks like SeaWorld, “who sentence dolphins to a lifetime of suffering and loneliness in captivity,” the organization said.

Panettiere’s quest for marine life conservation was a life-long pursuit, beginning when she was just a teenager advocating for animals with the Whaleman Foundation.

“Dolphins and whales are some of the most contaminated animals on the planet and like canaries in a coal mine they are telling us that something is seriously wrong with our oceans,” Panettiere said.

“We are poisoning the oceans’ food chain and ultimately poisoning ourselves and I think that is it vitally important to get this truth out to the younger generations who, after all, will be the ones to face up to the problems that are occurring today.”

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The “Nashville” actress died Sunday in Greenville, South Carolina. Brian Hickerson and his brother, Zach Hickerson, were with Panettiere at the time of her death, according to a police report.

Hickerson was among those at the Greenville apartment when Panettiere was found, and authorities executed a search warrant at the residence, according to the report. Police also conducted a welfare check Wednesday at a South Carolina home linked to the Hickerson brothers, but no one answered the door.

Preliminary autopsy results found no signs of trauma that contributed to her death, Fox News Digital confirmed.

“First responders and Emergency Medical Services arrived on scene and located a female in cardiac arrest,” the Greenville County Coroner’s Office said in a statement. “EMS personnel initiated advanced cardiac life support measures; however, resuscitation efforts were unsuccessful, and the individual was pronounced deceased at 2:32 PM.”

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The Greenville County Coroner’s Office and Greenville City Police Department launched parallel investigations into her death.

“At autopsy no signs of trauma were discovered that would have contributed to the death,” the coroner’s statement continued. “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.”

On Wednesday, the Drug Enforcement Administration (DEA) was contacted and is assisting in the investigation.

Panettiere is survived by her daughter Kaya, who was born in 2014, with her ex-fiancé, Ukrainian boxer Wladimir Klitschko.