He had been was diagnosed with a rare kidney disease in 1996, and had a transplant in 2004 that would ultimately fail in 2011.
Nadene Lomu, on Facebook, said: "It is with great sadness that I must announce my dear husband Jonah Lomu died last night
"As you can imagine this is a devastating loss for our family and may I ask that our privacy, especially the privacy of our two very young boys, be respected as we take them through this traumatic time. "
Lomu and his wife have two young sons, Brayley (6) and five-year-old Dhyreille.
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