Man dies during 100km Perth charity walk

A man has died during a 100km charity walk in Perth.

The man, who was taking part in the 100km Oxfam Trailwalker endurance event, collapsed in Swan View on Friday afternoon and was unable to be revived, a St John Ambulance spokesman told AAP.

It appears he suffered cardiac arrest during the first day of the event, which asks teams of four to walk a 100km bush trail within 48 hours to raise money.