TORONTO - An Ontario couple accused of killing a man and his mother now face a new murder charge involving another member of the same family.
Melissa Merritt and her common-law husband Christopher Fattore had already been facing first-degree murder charges in the deaths of Merritt's ex-husband Caleb Harrison and his mother, Bridget Harrison.
Their lawyers say the pair were also charged Thursday with first-degree murder in the death of William Harrison -- Caleb Harrison's father and Bridget Harrison's husband.
Caleb Harrison was found dead in August 2013 in a home in Mississauga, Ont. -- the same home where his mother died in 2010.
The 63-year-old woman's death was first classified as suspicious, but it was only when officers started investigating her son's death that they concluded both had been asphyxiated.
Police then re-opened an investigation into the 2009 death of William Harrison, who also died in the same home. Investigators had originally determined he died of natural causes.
