Country music legend Glen Campbell has cancelled his farewell tour of Australia and New Zealand next month due to his worsening health.
The 76-year-old Rhinestone Cowboy singer is battling Alzheimer's disease and a spokeswoman said he was not up to "the very long flight that it would require".
It would have been Campbell's last international stop on his Goodbye Tour. He was due to play six shows next month with Kenny Rogers and one solo performance in Brisbane, Australia.
Campbell's promoter said in a statement: "Due to a decline in his Alzheimer's condition his medical specialists have advised that the long international flight from Los Angeles would be detrimental to his health.
"Glen apologises and is very disappointed that he is unable to perform for his New Zealand and Australian fans one last time on what would have been his farewell visit and last international dates on his The Goodbye Tour."
Rogers is continuing the month long tour, kicking off on August 10 in Christchurch, New Zealand. Australian country artists will fill in as special guests.
Campbell announced in June 2011 that he had been diagnosed with Alzheimer's disease six months earlier, having been suffering from short-term memory loss for years.
During his 50-year career, he has released more than 70 albums, has sold 45 million records and amassed 12 RIAA Gold albums, four Platinum albums and one Double-Platinum album.
He is best known for dozens of hits in the 1960s and 1970s, including Gentle On My Mind and Wichita Lineman, as well as Rhinestone Cowboy.
He also hosted a variety show on CBS television, called The Glen Campbell Goodtime Hour.
Campbell received the Recording Academy's Lifetime Achievement Award earlier this year, and was inducted into the Country Music Hall of Fame in 2005.
He has been married four times and has eight children - five sons and three daughters - three of whom were joining him on the tour.
He sang Rhinestone Cowboy as a goodbye at the 2012 Grammy Awards held on February 12.