There was a sighting of Ross Bremner's car at his victims' home before he went on his murderous rampage, say police.
Waikato Police Detective Senior Sergeant Ross Patterson today said officers were continuing their investigation into the deaths of Clare Bremner, Mona Tuwhangai and Maurice O'Donnell three weeks ago.
Ross Bremner is believed to have killed his mother, Clare, and critically injured his father, Keith, with a knife at their Otorohanga home before fleeing to Kinohaku, near Kawhia.
It was there that his body was found four days later alongside elderly couple Mona Tuwhangai and Maurice O'Donnell.
Until today, it was believed that Bremner did not know his elderly victims before the attack.