Partridge Family star David Cassidy is in a Fort Lauderdale-area hospital in Florida with multiple organ failure.
Publicist JoAnn Geffen says he is suffering from liver and kidney failure and is in a private room, conscious and surrounded by family.
Geffen says there is nothing "imminent" about his condition and doctors are hoping to "keep him as well as they can until they can find another liver."
Earlier, his representative said Cassidy was in pain and taken to the hospital on Wednesday.
The 67-year-old former teen idol, who lives in the Fort Lauderdale area, said earlier this year that he was struggling with memory loss and was ending his 50-year career.
The actor and singer said travelling and his arthritis made performing difficult.
Cassidy has had numerous personal problems in the decades following his initial success, ranging from substance abuse to bankruptcy. He's the stepson of actress and fellow Partridge Family star Shirley Jones.
Reports of his hospitalization prompted a flood of supportive comments on social media.
His half-brother Shaun Cassidy, also a former actor and singer and now a TV producer, tweeted Wednesday afternoon, "Thank you for all your love and good wishes for David. It means the world to all of us."