He was tried in the Central District Court in Adelaide, South Australia. His surname is spelled Murdoch which might help.
The case was reported in the local media here. The local newspaper is
The Advertiser and it is online at
http://theadvertiser.com.au You may need to subscribe to its archive service though if you want information concerning the trial.
The trial itself is a matter of public record, however as he was acquitted the available information might be scarce. The appropriate contact point for that information is the Courts Administration Authority of South Australia which is located at
http://www.courts.sa.gov.au/ - there is a facility for inquiries there.
If you get the run-around from the bureaucracy you need to be aware that the Freedom of Information Act here is complex and skewed towards making information unavailable but here's a link to the legislation
http://www.austlii.edu.au/au/legis/sa/consol_act/foia1991222/
Other South Australian government agencies/bodies can be located here
http://www.sacentral.com.au