Former Blue peter presenter John Noakes, who hosted the show in 1960s and '70s, has died at the age of 83
Noakes was the BBC children's show's longest-serving presenter, appearing for more than 12 years and was often seen with his dog Shep by his side.
A family statement said he had "endured and suffered from" Alzheimer's disease.
"Whilst he will be greatly missed by his wife, family and many friends his release from continuing ill health must be counted as a blessing," it said.
"His many escapades with his faithful companion Shep, during his time with Blue Peter, will live on in many peoples memories. that is how his family would like him remembered."
Noakes joined the show at the end of 1965 after training as an engine fitter for the RAF, and stayed until 1978.
He became a favourite as the show's action man, and continued to play on that image with several series of Go With Noakes, where he travelled around the UK with Shep alongside him.
He appeared on Blue Peter with co-presenters including Christopher Trace, Valerie Singleton, Lesley Judd and Peter Purves.
Purves told BBC News that Noakes's death was "very sad" but added that the Alzheimer's had become "extremely serious" in recent years.
Remembering his friend, he said: "He was uunique. He had qualities that no-one else had and he'll be remembered very fondly by a lot of people, and none more so than me."
He was "very, very brave" in doing his many status in doing his many stunts and adventures, Purves added.
"We had so much fun togethe over the years. There were hundreds and hundreds of happy memories. I'll never forget him."
Other previous Blue Peter hosts added their tributes.
Janet Ellis, a presenter from the 1980s, wrote: "The best bravest, funniest BP presenter. If we didn't walk in John Noakes' shadow it's because he shone the light for us. RIP."
Konnie Huq, who appeared in the 1990s and 2000s, wrote on Twitter that he was "a legend", adding: "John Noakes. Best Blue Peter presenter ever. RIP. So sad."
Sarah Greene added: "Deepest condolences to the family of John Noakes. He made us feel we could all get out there & whizz down the Cresta Run, he broke the bounds."
Zoe Salmon, who fronted the show between 2004 and 2008, tweeted: "I am deeply saddened to hear about John Noakes, a Blue Peter legend who will live on in our hearts. Privileged to have met him."
Katy Hill wrote: "SADDEST news about the legendary John Noakes who inspired me to want to present Blue Peter & do EVERYTHING he did. THE BEST!"
BBC director general Tony Hall described Noakes as "one of the BBC's most loved children's presenters."
In a statement, he said: "He was a warm and engaging presenter who appealed to all ages and provided children's TV with some of its most memorable moments. he will be missed by his many friends and family."