Detectives searched a property and interviewed ‘’people of interest’’ in relation to the death of 63-year-old David Lawrence.

“We were assisted by detectives from the Lake Illawarra Criminal Investigation Branch,’’ said Detective Superintendent Des Bray from the South Australia Police Major Crime Investigation Section.

“NSW police will be executing further warrants in the future on behalf of SAPOL as we continue this investigation,” he said.

The South Australian detectives revealed on Friday they were treating the death of Mr Lawrence as a ‘’deliberate fatal poisoning’’.

Mr Lawrence was found dead in his bed by his partner at their home on Godfrey Court on December 3, 2015.

Initially his death was investigated by police from South Coast Local Service Area – as it was unexpected, although there were no obvious suspicious circumstances.

Toxicology results later showed that Mr Lawrence died from lethal levels of prescription opiates and other prescription medication, most of which had never been prescribed to him.

Detective Superintendent Des Bray said police believed a person known to Mr Lawrence deliberately over dosed him with these medications with the intention of killing him.

Investigators were now seeking the assistance of any member of the community who believed they may have information that could assist police in this case.

“Mr Lawrence was a well-known and popular member of the community, who he had lived at the same address for more than 30 years,” Detective Superintendent Bray said. “Investigators have been in regular contact with Mr Lawrence’s next of kin – his three brothers and two sisters – throughout the course of this inquiry.

“Police are making ongoing inquiries … whith the ultimate objective being holding the appropriate person to account for this death.’’

Anyone with information, call Crime Stoppers on 1800 333 000 or report online at https://crimestopperssa.com.au/