Jeff Conaway – who played Kenickie in cult film Grease – has been badly hurt after a fall at his California home.
The 59-year-old was rushed to hospital and underwent emergency surgery after tumbling down a staircase.
His girlfriend Vicky Lizzi said he had suffered a brain haemorrhage, a fractured neck, a broken arm and a broken hip as a result of the fall.
She also said the actor – who has admitted to drug addictions in the past – feared "these are his final days".
Jeff is probably best known for playing John Travolta's right-hand man in the 1978 musical movie.
In 1980 he married Olivia Newton-John's sister Rona and the couple had a son Emerson together, but the marriage fell apart after five years.
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