The brother of a businessman found shot to death at his New Jersey mansion has been charged with four murders, including the deaths of his sister-in-law, niece and nephew. Paul Caneiro, 51, is also charged with setting fire to his and his brother's home. Nancy Grace explores the case with forensics expert Joseph Scott Morgan -- author of "Blood Beneath My Feet," North Carolina family and divorce lawyer Kathleen Murphy, and Crime Stories reporter Robyn Walensky.
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