"It's with a heavy heart and awful sadness that I let you know that my beautiful husband John passed away last night," she wrote alongside a wedding photo.
"As you all know, John has faced some tremendous challenges over the past few years and with each he has been extraordinarily brave and determined to overcome those hurdles and live a normal life."
She then addressed all those who helped him during his trialling time.
"I want to thank everyone at St Vincent's Hospital for the beautiful care they have provided to John in his last days."
"John passed away peacefully with his son Simon and me by his side."
Kerri-Anne ended her tribute, saying, "John, you were the love of my life. Xxx"
Kerri-Anne married John in 1984.
The couple were the picture of marital bliss until their world was turned upside down when John suffered a freak fall at a golf resort near Coffs Harbour in 2016, leaving him with quadriplegia.
Speaking to Sunday Night of her husband’s heartbreaking accident, “My life as I knew it is over”.
“[He] lost his balance and fell backwards. Spearheaded the ground,” she told reporter Mike Willesee. “And as soon as I went round ... went round a few steps down, and he was then on his side. All he could say is, ‘I can’t feel anything’.
“And we were then waiting for the ambulance. I just sat at his head and said everything was going to be OK. Nobody wanted to roll him.”
Her then 75-year-old husband was put into a coma to be operated on,
Following the surgery, she was told: “It’s gonna be a year. It’ll be a year before you know what he’ll be left with. And we don’t know.”