Darlene Bieber said the 80-year-old Grand Ole Opry star, known for his trademark rhinestone stage outfits, "is asking for prayers from his friends and fans."
She had no other information, Bieber said Thursday.
WSMV-TV reported that Wagoner was admitted to the hospital earlier this week for observation.
He was hospitalized for two weeks in July 2006 after suffering a stomach aneurism.
In May, he celebrated his 50th year on the Grand Ole Opry, the long-running live country music show. He helped launch Dolly Parton's career by hiring her as his duet partner in 1967.
Wagoner's career took an upturn this year when he signed with ANTI-records, an eclectic Los Angeles label best known for alt-rock acts such as Tom Waits, Nick Cave and Neko Case. He released the album "Wagonmaster," earning Wagoner some of the best reviews of his career.
Wagoner was the opening act for the White Stripes at a sold-out show at Madison Square Garden in Manhattan this summer.
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On the Net:
Porter Wagoner:
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Parton sang for mentor in his last hours
Oct 30, 2007 4:00 am PDT
Dolly Parton says she feels like a part of her died along with her old duet partner, Porter Wagoner. But Parton says she was grateful that she was able to spend a few final hours with the man who launched her career before he succumbed to...
Country star Porter Wagoner dies at 80
Oct 29, 2007 8:00 am PDT
Porter Wagoner was known for a string of country hits in the '60s, perennial appearances at the Grand Ole Opry in his trademark rhinestone suits, and for launching the career of Dolly Parton. Like many older performers, his star had faded...
Grand Ole Country Great Wagoner Dies
Oct 29, 2007 1:00 am PDT
Porter Wagoner, the rhinestone cowboy who made shiny suits and Dolly Parton fashionable, has succumbed to lung cancer. He was 80. Complications from the disease forced Wagoner into a Nashville hospital earlier this month. He was discharge...
Country singer Porter Wagoner dies at 80
Oct 28, 2007 9:27 pm PDT
U.S. country singer Porter Wagoner, lanky Grand Ole Opry star whose flashy Nudie rhinestone suits dazzled fans when he sang with rising new performer Dolly Parton in the 60s, died on Sunday from lung cancer, said his publicity agent, Darle...
Porter Wagoner moved to hospice care
Oct 26, 2007 3:00 pm PDT
Porter Wagoner, who was recently diagnosed with lung cancer, has been released from the hospital and moved to hospice care on Friday, a spokeswoman for the Grand Ole Opry said. Wagoner, 80, a member of the Grand Ole Opry since 1957, was h...