Police say human remains found earlier this week on farmland near Caledon Village were those of an adult woman.
There are reports it was a human skull that was found.
The remains were found near Charleston Sideroad and Willoughby Road by the property owners of the land.
The bodies of Sonia Varashin and 20-year-old Kera Freeland were found only kilometres away in Sept. 2010 and March 2011, respectively.
On Boxing Day 2011, more human remains were found just east, in a rural area near Bolton.
Police aren't connecting any of the cases yet.
"It's far too early to speculate about that," OPP Const. Jonathan Beckett told CTV Toronto.
A post-mortem was performed Friday in Toronto.