Son says his dad got sick shortly after he married wife Betty years ago . He will look into deaths of five husbands of Betty Neumar . Son says he learned of his dad 's death in newspaper , body was cremated .
Son says his dad got sick shortly after he married wife two decades ago . Authorities launch probe into deaths of five husbands of Betty Neumar . Son says he learned of his dad 's death in newspaper , body was cremated .