Personal Details
- Last seen: Thursday, 11 December 1997
- Year of birth: 1972
- Height: 180 cm
- Build: Medium
- Eyes: Hazel
- Hair: Blonde
- Gender: Male
Circumstances
William, who preferred to be called Maddison was last seen in Perth on the 11th of December, 1997. On the 17th of December, 1997, Maddison telephoned his girlfriend from Carnarvon, Western Australia, stating that he intended travelling around Australia.
