Former Blue Peter presenter John Noakes, who hosted the show in the 1960s and 1970s, has died aged 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.
He was also known for his daredevil stunts like climbing Nelson's Column and jumping out of planes - and for his famous encounter with a baby elephant.
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 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 unique. 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 stunts and adventures, Purves added.
"We had so much fun together over the years. There were hundreds and hundreds of happy memories. I'll never forget him."
G2 has published books from both Blue Peter presenters including The Flight of the Magic Clog children's story by John Noakes - https://tinyurl.com/y7eexgue - and Peter Purves's autobiography Here's One I Wrote Earlier - https://tinyurl.com/ybov2vbh