A lawsuit claims that Pamela Smart was wrongly put into solitary confinement after a prison guard found a plastic cake knife in her cell. Pame Smart is serving a life sentence in a New York prison for her role in the 1990 murder of her husband, Gregg Smart, in Derry. In a federal lawsuit, Pame Smart alleges that the guard confiscated the knife in 2012, even though she had it for 17 years and it …