Sixty-six-year-old Robert Ferrante was convicted in November of first-degree murder in the April 2013 death of 41-year-old Dr Autumn Klein. Prosecutors said he laced her energy drink with cyanide.
The victim's mother, Lois Klein, said in a statement read in court today by an assistant prosecutor that the murder had robbed her and her husband of their only child.
She said, "The light of our lives has now been extinguished."
She immediately collapsed and died three days later, authorities said.
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Prosecutors showed the jury text messages in which Ferrante told Klein the drink might help her ovulate and conceive a second child, which witnesses said Klein was obsessed with having.
Ferrante, though outwardly supportive, allegedly resented that, however, and feared Klein might divorce him so he killed her instead, according to prosecutors.
A prominent researcher into Lou Gehrig's disease, Ferrante testified he bought the poison only because he used it to mimic the disease's effects on healthy cells in his laboratory.
Jurors indicated that alleged change of Ferrante's story, and other evidence, prompted them to reject his denials and convict him.