Australian actress Ruby Rose has paid an emotional tribute to Hayden Panettiere, following the US star’s tragic passing on Sunday, aged 36.The New York-born actress died on August 16, after going into cardiac arrest following a suspected overdose at a loft apartment in South Carolina.Rose shared a social media tribute to Panettiere, posting a photo of the late actress alongside some bizarre words.’Hayden, I am begging you. No. My friend, no! WHO do we call? What is happening?’ a distraught Rose, 40, wrote.The pair never worked together on a production and moved in different social circles, so it is unclear how close they were or whether they had met.It is also unclear exactly what Ruby was referring to, though the post may have alluded to recent online discussions about Panettiere’s friendship with former co-star Michelle Trachtenberg, who died 18 months ago aged 39. Australian actress Ruby Rose has paid a bizarre tribute to Hayden Panettiere, following the US star’s tragic passing on Sunday, aged 36The former child stars famously shared the screen in Disney’s 2005 hit Ice Princess, playing unlikely best friends and competitive figure skaters. In audio from a 911 call, a female dispatcher described the 36-year-old Heroes and Nashville star as suffering a ‘cardiac arrest’. Moments later, a male dispatcher said Panettiere was believed to have suffered a suspected overdose at the property.Narcan was reportedly found in the apartment where Panettiere died following what authorities are investigating as a possible overdose. An autopsy conducted by the Greenville County Coroner also showed Panettiere had ‘no signs of trauma discovered that would have contributed to the death’. Narcan, a nasal medication used to treat opioid overdoses, was also found on a mattress at the property, according to an unnamed source who spoke with TMZ. Detectives confirmed to the Daily Mail that they responded yesterday afternoon to a 911 call from an ‘acquaintance’ of the star, describing her as ‘unresponsive’.Officers and paramedics carried out chest compressions while trying to save Panettiere’s life at the Judson Mill Lofts apartment block. Ruby shared a social media tribute to Hayden on social media, posting a photo of the late actress alongside some bizarre words It is also unclear what Ruby is specifically referring to, but it may allude to recent online posts noting Panettiere’s tragic friendship with her former co-star Michelle Trachtenberg, who died just 18 months ago aged 39. (Pictured together in 2011)But the actress, who was due to turn 37 on Friday, was pronounced dead at the scene at 2.32pm, just over 40 minutes after the first 911 call was made.Police are investigating the death, but said the ‘preliminary investigation has not indicated any signs of foul play or suspicious circumstances’.The star and her on-off real estate agent boyfriend Brian Hickerson were said to have flown from Los Angeles to South Carolina, where he is from, one day before she died.Panettiere had an 11-year-old daughter called Kaya, but later gave full custody to her former fiancé, Ukrainian boxer Wladimir Klitschko.In her final Instagram post on July 27, Panettiere shared a photo with her director and photographer friend Randall Slavin, captioning it: ‘Good times and good friends.’ The star began acting as a child, appearing in soap operas, then gained wider recognition for her role in the 2000 sports drama Remember the Titans with Denzel Washington, and as the voice of Dot in Pixar’s 1998 film A Bug’s Life.Panettiere later found fame playing cheerleader Claire Bennet in the superhero drama Heroes before starring as country singer Juliette Barnes for six seasons on Nashville.