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(NECN: Scot Yount, Woburn, Mass.) - "His ultimate determination, is hell," said Middlesex County District Attorney Gerry Leone.
It was unspeakable. Thomas Mortimer IV killed in cold blood his 41-year-old wife Laura, his 64-year-old mother in law, his 4-year-old son Finn and his 2-year-old daughter Charlotte.
First responders were struck by the enormous amount of blood they found at the scene of the family home in June of 2010.
Now, Mortimer, who was arrested a short time after the murders, has changed his plea to guilty.
"The losses of our loved ones can hardly be expressed in words," said Debra Stone, Mortimer's sister-in-law.
As part of the court process, Moritmer's sister-in law struggled to tell the court about her family.
"My life, my family's life, my children's life, have been so affected. None of our lives will ever, ever be the same," said a tearful Stone.
Laura Stone Mortimer's best friend Amanda DaSilva described their relationship, and said that her three-and-a-half-year-old daughter simply does not understand.
"When she sees me crying for any reason, she says, ‘mommy, do you miss your friend?’ And when we drive by any cemetery, she looks out and says, ‘is that where your friend lives?’ That's how often I have taken her there to visit their graves," said an emotionally moved DaSilva.
"This is one of the most disturbing cases and crime scenes I have ever seen," said Middlesex District Attorney Gerry Leone.
The District Attorney's office said it was very rare for a defendant in a case like this to plead guilty, saving the victims’ families the grief of a trial.
"He's been fully held accountable for these heinous, unspeakable, troubling and disturbing acts," said Leone.
Middlesex Superior Court Judge Jane Haggerty sentenced the defendant to life in prison without the possibility of parole.