Police have arrested a 21-year-old man in relation to the disappearance of Mt Gambier man Gordon Hamm Mt Gambier man Gordon Hamm has not been seen since he was abducted from Nelson last July. A THIRD man has been arrested over the disappearance of missing Mt Gambier man Gordon Hamm. The Mt Gambier man, 21, was arrested yesterday and charged with being an accessory to murder. Two other Mt Gambier men, a 29-year-old and 35-year-old, were extradited to Victoria and charged with murder in July. The arrest follows a joint operation between Victorian and South Australian Police. Mr Hamm was allegedly in a vehicle which was stopped on a bridge at Nelson, in Victoria, by two vehicles on July 17 last year. It is alleged he was taken from the vehicle at gunpoint, bashed in a nearby playground and killed over a drug debt. At this stage, his location remains unknown and investigations are continuing. Police urge anyone that may have any information regarding the disappearance of Mr Hamm to contact Crime Stoppers on 1800 333 000 or online at www.sa.crimestoppers.com.au