Jansen Panettiere, Walking Dead star and brother of actor Hayden Panettiere, has died at the age of 28 in New York.

On Sunday around 5.30 pm, the New York Police Department (NYPD) received a call to an apartment in Nyack, where investigators found him dead. Some media reports indicate that Jansen was dealing with anxiety and depression issues. The actor admitted on his website that he had previously struggled with depression and that his anxiety difficulties gave him the confidence to start painting his troubles.

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Panettiere had become hooked on opioids and underwent treatment for drug addiction a year before his death, according to a report by Daily Mail. Neighbors have said he had abused prescription painkillers, believed to be Oxycodone, and had been consuming them like gumballs over the years.

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According to Daily Mail, Jansen seemed to have sobered up after completing a stint in rehab last year, before falling off the wagon again in recent months. On Tuesday, police said the 28-year-old was found unresponsive at his apartment on Sunday evening. He was declared dead after failed attempts to revive him. Police have denied the possibility of any foul play in his death. The cause of his death has not been revealed by authorities.

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However, neighbors say they wouldn’t be if he has suffered a fatal overdose as the actor was often seen returning to his apartment in the early hours of the morning looking wasted and shabbily dressed.

“He’d come out of a car at 4 am wasted,” said the local, reported Daily Mail. “He said he was just coming back from a shoot. He looked destroyed,” the person added.

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“When he left he probably went into rehab. He moved out, his dad grabbed his stuff. When he came back he looked okay in the beginning. He looked like a different person. He came back straightened up. Then he went downhill from there,” another neighbor said.

According to Orangetown Police Sergeant Peter Maher, no cause of death has yet been determined as they are awaiting an official determination from the Rockland County Medical Examiner. Whether he overdosed on drugs or not is unknown.