Cape Town - Former All Blacks doctor John Mayhew is in an induced coma after collapsing following an exercise class in Auckland.
According to the Stuff website, Mayhew, 61, was taken to hospital after his collapse on Tuesday night.
A family spokesperson said Mayhew suffered a cardiac arrest as a result of a heart problem.
He was successfully resuscitated and is now in an induced coma in intensive care in North Shore Hospital. He's in a stable condition.
Mayhew, a friend and doctor to the late Jonah Lomu, was invested as an Officer of New Zealand Order of Merit for his services to sports medicine just last week.
Mayhew spent 13 years as All Blacks doctor and stood on the sidelines for 131 Tests and more than 200 matches.
Mayhew became close friends with Jonah Lomu during his time with the All Blacks as the legendary winger struggled with kidney problems.
He was a source of great support to Lomu's family following his death last November and served as a pallbearer at the Eden Park memorial service.