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Stallone s half-sister dies
Sylvester Stallone. Picture: Frazer Harrison/Getty Images.

Sylvester Stallone is mourning the death of his half-sister just six weeks after losing his son.

The Rocky star's 36-year-old son, Sage, was found dead in Los Angeles in July and the family was struck by tragedy again on Sunday when the actor's half-sister, Toni Ann Filiti, lost her battle with lung cancer.

The 48 year old passed away at the home of her mother, Jackie, in Santa Monica, California on Sunday morning.

"I was holding her in my arms," Jackie tells the New York Daily News.

"I had just washed (her) face and told her how pretty she looked, and she just fell asleep... She's too young to go, but she wasn't feeling any pain. What a terrible month. First Sage and now Toni. It's hard. At least they're together now in heaven."

The 90 year old says her superstar son was devastated by the news of his half-sister's death, but has vowed to remain close to Toni's son.

"He said he can't take any more pain. He said he'll always be there for her son."