Angelika Graswald, 35, pleaded not guilty to charges of second-degree murder and second-degree manslaughter.
Authorities said she admitted to removing the plug from fiancé Vincent Viafore's kayak during a kayaking trip in the Hudson River in April. But her lawyer said her confession was coerced.
Graswald told the ABC News show “20/20” that she is innocent of the charges.
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