The documentary aired on Three on Sunday and since then, social media has been awash with fans hailing him as a "hero", a "warrior" and "a national treasure".
They also called the doco moving, raw, honest and inspiring and many thanked Walker for sharing his story and portraying the struggle of cancer "beautifully".
One fan wrote: "Thank you Stan Walker and whanau for sharing your intensely personal and emotional story with us. Admire your courage, good humour and aroha."
Another added: "I'm in awe of his courage and grace".
TEARS. @1stanwalker's documentary was superbly done 😭 with a dad who died of stomach cancer it hit me right in the feels. People who say he was milking his illness for money/promo are FULL OF IT. It was nothing but cancel awareness done beautifully.
Ngā mihi nui to @1stanwalker for sharing his story - I know a number of ppl that have had their stomach removed due to CDH1 & others where it was too late. Love how you take care of your whānau x
Others simply tweeted about how moved they were by Walker's story and took the opportunity to wish him luck - including fellow musicians and Kiwi personalities.
Just watched the Stan Walker doco and feel truly moved. You’re an inspiration Stan. Got your back bro ❤️
Couldn't sleep so I put on the @1stanwalker doco. As soon as he said "I know I'm gonna beat this, and nek minute I die" I knew it was going to be good 😂 Highlight was watching the bond he has with his mum. Cried, laughed, reflected on my own health aswell, AWESOME WATCH 💙