Daniel O'Keeffe disappeared during a battle with depression, but his older sister has vowed she will never stop searching.
Dan went missing from his home near Geelong in Melbourne in 2011 and his case was initially treated as suspicious.
But four months later he was spotted alive in Queensland.
His sister Loren, has since quit her job, instead dedicating herself to an online, media and public campaign to find her brother.
Loren has now decided to start a website, hoped to go live next month, that gives guidance to people who are making finding their loved ones a priority.
For more information on Loren O'Keeffe's campaign to find Dan visit: