A motorcyclist has died after suffering a medical event at Kingseat, south of Auckland.

Police were called by St John Ambulance staff at 10.20am after the motorcyclist was found in a critical condition on Kingseat Rd near the intersection of Waiau Pa Rd.

The rider died at the scene.

Police said there did not appear to be a crash, rather the rider died as a result of a medical event.