Police have obtained a DNA profile from the crime scene, a week after Andrew and Rose Rowe and their 16-year-old daughter Chantelle were stabbed to death in their rented home in the South Australian town.
Forensic results from the crime scene were still coming in but police now had a DNA profile, Superintendent Grant Moyle told reporters on Monday.
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"I am able to reveal today that we have obtained the DNA profile of an unknown male person from the crime scene," Supt Moyle said.
Youths known to the slain family had voluntarily given DNA swabs to help eliminate suspects and police might consider an extension of the testing, he said.
Police are also keen to talk to the owners of a white four-wheel-drive traytop Toyota Landcruiser seen outside the trio's house about midnight on November 6.
The family is believed to have been murdered in the early hours of November 7.
"There were two people in the vehicle," Supt Moyle said.
"We have information that one person got out of the vehicle."
Supt Moyle declined to answer questions about the age or gender of the two people, or whether the person who left the car entered the house.
Officers were continuing to follow a number of "positive" lines of inquiry, he said.
