James Lee Green, 27, of Western Bay of Plenty, entered a not guilty plea to a single charge of being an accessory after the fact of murder by helping Walker evade arrest.
Leon Colin Wilson, 49, of Hamilton, Christopher Ramia Smith, 34, and Grant Stewart Wickens, 33, of Hamilton, all entered not guilty pleas to a charge of manslaughter.
All were remanded in further custody to reappear for a case review hearing in October.