Updated

Pamela Smart, a New Hampshire school employee who was sentenced to life after her teenage lover killed her husband, claims in a lawsuit that she was wrongly put in solitary confinement for 90 days.

Smart was a media coordinator at Hampton's Winnacunnet High School when she seduced a 16-year-old boy in 1990. He claimed she threatened to break up with him if he didn't kill her husband; she has denied planning the murder.

In a lawsuit amended this week, Smart says she was wrongly punished after a plastic utensil used to slice cheesecake was found in her cell in Bedford Hills, New York.

A spokeswoman for the New York attorney general's office, which is representing prison officials, had no immediate comment.

Smart's case inspired the novel and movie "To Die For."

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This story has been corrected to show the lawsuit was amended, not filed, this week.