What caused psychiatrist to turn into a killer?

NBC’s chief medical officer, Dr. Nancy Snyderman, reports on Maj. Nidal Malik Hasan, and Army psychiatrist and the man authorities say killed 13 people on a U.S. military base. (Other)

MSNBC | November 6, 2009

Tags:. .nidal. .psychiatrist. .maj. .hasan. .malik