Labor Committee and House Education holds hearing on school bullying . 11-year-old Walker hanged himself this day . Boy had been subject to `` relentless '' bullying , mother says . One expert calls bullying a national crisis .
House Education and Labor Committee holds hearing on school bullying . 11-year-old Carl Joseph Walker-Hoover hanged himself April 6 . Boy had been subject to `` relentless '' bullying , mother says . One expert calls bullying a national crisis .