The body of a woman found in a cattle dip near Murwillumbah in northern New South Wales last week has been identified as that of missing grandmother Yvonne Whear.
The 73-year-old was last seen driving near Murwillumbah, on Thursday, February 19.
A pair of trail bike riders found the body while riding on a track through a property at Kyogle Road at Terragon around 11:20am on Monday, October 5.
Ms Whear's badly decomposed body was found submerged in a tank used to treat livestock for ticks and other parasites.
NSW Police Acting Superintendent Matt Zimmer said a strike force had been formed to investigate her death.
"We are now treating her death as a homicide," he said.
"The news of Yvonne's death in these circumstances is tragic. Her family are devastated.
"We spoke to her family a short time ago and they have described this loss as unimaginable grief."
Forensic and specialists officers were called to examine the body and the scene. (ABC North Coast: Lachie McLeod)
Acting Superintendent Zimmer said Ms Whear "had no criminal history".
He said she was a mother of three, grandmother of 10, and great grandmother of one child.