A $100,000 reward and possible immunity is on offer for clues leading to the conviction of whoever's responsible for killing Auckland man Arthur Easton almost 40 years ago. The case was re-opened after Alan Hall, the man found guilty of the murder, had his conviction quashed by the supreme court after it found a substantial miscrarriage of justice. Mr Hall spent 19 years in jail for the murder of Arthur Easton - who was stabbed to death during a home invasion in Papakura at about 8pm Sunday 13 October 1985. It was later found the description of the attacker and key witness statements has changed with original descriptions describing the offender as Maori, more than 6 foot and right handed; Alan Hall isn't. Earlier this year, three men were charged in relation to the wrongful conviction. Today flanked by photos of the brown wool beanie and knife used by the real killer Detective Inspector Warwick Adkin announced the reward, he spoke to Lisa Owen.