Olympic gold medalist Sir John Walker has stepped down from chairing an Auckland Council committee for medical reasons.
The 63-year-old councillor, who was diagnosed with Parkinsons disease in the early 1990s, has resigned as chair of the council's audit and risk committee.
Sir John told the Herald he could not continue chairing the committee properly but would continue work as a councillor.
He said his health had not deteriorated, but the medication he was on was a "bit hit and miss".
In the past year, Sir John has had difficulty with walking and trouble speaking.