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Gilberto Nunez: "I wasn't there ...what do you want me to tell you?"

| In police interview video, Ulster, N.Y., Det. Michael Thomas and Investigator Joseph Aureimma Jr., look into the November 2011 death of Thomas Kolman, accusing his best friend, dentist Gilberto Nunez, of murder. "48 Hours" correspondent Richard Schlesinger has more on the case in "Death and the Dentist" airing Saturday, April 8 at 10 p.m. ET/PT on CBS.