Peter Lanza, father of Sandy Hook shooter Adam Lanza, breaks his silence and wants others to know this can "happen to them." The New Yorker's Andrew Solomon sat down with Lanza for multiple interviews totaling more than 25 hours of conversation. Solomon talks to NBC News' National Correspondent Kate Snow about Lanza's lessons from being the parent of a child who went on to do so much unthinkable damage.

NBC News' National Correspondent Kate Snow speaks with New Yorker writer Andrew Solomon about his gripping interview with Peter Lanza tonight on Nightly News with Brian Williams.