'Concerning Behaviour' Towards Leslie Larkin Focus Of Cold Case Murder Investigation

Police have revealed events in the lead up to the murder of Noosa Heads woman Leslie Larkin could help solve the 34 year mystery.

The 31-year-old yoga instructor was found naked and with significant head injuries in her apartment in early November 1984. She died a day later.

The front door of Larkin's apartment was open and there was no sign of sexual assault, however the room was so bloody police believe the killer must have been covered in it.

Image: QLD Police

"[It was ] a very brutal attack, she was bludgeoned to death, there's no other way of putting it," Sunshine Coast Police Detective Inspector David Drinnen said on Wednesday.

Recently received information into the murder has renewed the investigation, which was re-opened in 2014.

"New information that relates to concerning behaviour that may have occurred, which involved the deceased." he said.

"As a result of that the State Homicide Squad and Sunshine Coast detectives are now undertaking a number of inquiries in relation to the murder."

Larkin had been living in her apartment for just two weeks before she was murdered, and investigators believe she had confided in friends about events that occurred in this time period.

"[People] who had, at the time, socialised with Leslie Larkin, they may have critical information that can assist us," Drinnen said.

Image: QLD Police

Drinnen is optimistic police are "close" to solving the case, bringing closure to Larkin's elderly mother.

"Further information can only strengthen our evidence," he said.

A $250,000 reward remains in place for information that can help solve this crime.

With AAP.