The long-haired rocker, best known for hits such as Turn Up Your Radio, Living In A Child’s Dream, Elevator Driver, 5-10 Man and It’s Because I Love You, had been admitted to hospital earlier this month with pneumonia.
A spokeswoman said that Keays had died at 10.30am this morning following complications arising from multiple myeloma.
He has been fighting the disease, a bone marrow cancer which affects plasma cells and weakens the immune system, for seven years.
As quoted on the Sky News Australia website, bandmate and friend Glenn Wheatley paid tribute to Keays.
““I had the pleasure of sharing some of the best years of my life with Jim Keays, it really was like Spinal Tap,” he said.
Keays is survived by his partner and three children.
Image credit: Getty