On the marae, he was remembered as a standard-bearer for Maori rights, language and customs - and as never being one to back down or keep quiet about sharing his opinions.
Former Maori Party leader Dr Pita Sharples said he first met Dr Walker as a young student. "I think his greatest gift was being able to explain what it was like to be colonised and the actual things that colonised us - the events, the laws, the practices and culture of tauiwi [outsiders]," he said in a Radio NZ report.
Dr Walker will be cremated after a funeral service tomorrow.
His farewell will be live-streamed by Maori Television.