Steady police progress in Mannum homicide inquiry, South Australia

In the 12 months since Adrian Trett was found unconscious on David Street at Mannum with serious head injuries SA Police have been making steady progress on the case which tragically, on 5 May 2018, became a homicide inquiry.

Mr Trett (pictured below) died in the Royal Adelaide Hospital without ever regaining consciousness.

A team of experienced officers from the Major Crime Investigation Branch, assisted by local police, have made regular trips to Mannum since, gathering evidence and taking statements.

Images of a mobility scooter and a distinctive motorbike helmet, along with the blankets the 45-year-old’s body was found hidden under, have been released to the public.

Tonight the case was featured on Channel 9 as part of a long-running partnership between SA Police and Crime Stoppers.

Detective Brevet Sergeant Ann Schaefer said police know that Mr Trett was the victim of an assault at a property on Asmus Street and fell down a set of stairs, but are still seeking evidence around the full details of that incident.

“We are confident we know how he (Mr Trett) got to the David Street location where he was found – he was taken there on a mobility scooter and we know who was involved in that.

“We are still seeking information about what exactly occurred at the Asmus Street address on 22 April 2018, and we would appeal for anyone with information to come forward.

“We have one specific person of interest, but believe others will have information that could be of value.”

In the 12-months since the assault police have made steady progress in the case, but need a few final details to be able to get to the bottom of what happened, and provide his family with some answers.

“His family, as anyone would, just want answers to their questions,” she said.

“We believe he was taken to the location on a mobility scooter (also called a gofer) and then his actual two-wheeled scooter was also conveyed there and he was lying beside that covered in blankets in a way that he could not have done himself.

“We believe those blankets came from the Asmus Street property.

“Any information, not matter how trivial or insignificant someone may think it is, given what we already have, it may be the final piece we need.”

Anyone with information that may assist investigators is urged to call Crime Stoppers on 1800 333 000 or report online at

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