Potter, 53, has been on the run since he failed to appear on bail for conspiracy to murder charges at Melbourne Magistrate's Court on 1 February, 2010.
Despite a number of sightings in Queensland and several nation-wide public appeals, Potter has managed to evade police capture for 12 months.
Potter is currently facing criminal charges of conspiracy to murder and is also wanted in relation to serious Commonwealth drug charges.
Since Potter failed to appear at Melbourne Magistrate's Court last February, Victoria Police and the Australian Federal Police (AFP) have been working closely together and with other state law enforcement agencies to try and determine his location.
Detective Superintendent Gerry Ryan said today's reward announcement was in the hope Potter could be located and brought into custody safely.
"We've already made a number of appeals to Mr Potter to turn himself in and we are doing so again today," he said.
"Police understand that Mr Potter has ended up in a position that is not all his own doing. Investigators appreciate the he was only one person in a significant established criminal network and that his actions at the time were not necessarily him acting alone or directing the activities.
"While we would prefer Mr Potter to hand himself into police in the interests of himself, his family and the community, we appreciate that he may not be willing to do so.
"Police wish to coordinate a successful surrender plan with Mr Potter in the interests of bringing this to an end safely without incident or injury and we ask that he contact his solicitor, police investigators or Crime Stoppers to facilitate this.
"We hope the $100,000 reward is a great incentive for someone within the community to come forward with information that leads to the arrest of Mr Potter."
The AFP is committed to providing resources to the search for Mr Potter and will do so in close cooperation with its state police partners.
Potter was last sighted by local police in Tully, Queensland, south of Cairns and north of Townsville, on Saturday 28 August when he ran from a vehicle during a routine police intercept.
An extensive search was carried out and his camping equipment was seized by the Queensland Police Service.
It is believed that the 53-year-old was residing in Tully for approximately six weeks prior to his detection by police.
Before his sighting in Tully, police believe that Mr Potter travelled to NSW around April 22, 2010, where it's believed he attended the Sydney Central Train Station before later returning to north Queensland around the Tully and Ravenshoe areas.
Police have spoken with a Ravenshoe woman, who was unaware of Potter's history, that Potter lived with for several months.
Due to recent flooding in Queensland, investigators have been targeting caravan parks across Australia during their search and working to provide owners with information as Potter is known to be a frequent user of this type of accommodation.
A number of images of Potter have been released and most recently he has been seen with a ginger beard and dyed brown hair to avoid detection.
He is described as Caucasian, 175cm tall, medium to solid build, brown eyes, fair complexion with brown greying hair and a ginger beard. He has a gold sleeper earring in both ears, wears glasses and regularly wears a gold chain around his neck.
Potter has a propensity for changing his appearance and has used a number of aliases including Josh Lawson, John Page, Jim Henderson and Peter Adams.
Anyone who sights Graham Gene Potter is advised not to approach him but contact Triple Zero (000). Anyone with any information regarding his whereabouts is asked to contact Crime Stoppers on 1800 333 000 or visit www.crimestoppers.com.au.
Media Contact:
Leonie Johnson/Natalie Webster
(03) 9865 2178 or 0419 540 794
