Convicted killer's, Dellen Millard and Mark Smich will find out if they will serve two life sentences back to back or together.
A sentencing hearing is set for today in Toronto.
The two men were convicted of first degree murder in the slayings of Tim Bosma of Ancaster and the presumed death of Laura Babcock of Toronto.
First degree murder carries an automatic life sentence with no chance of parole for at least 25 years.
Millard will stand trial next month for the murder of his father Wayne Millard.