Supporters of Trayvon Martin march in New York City on March 21. The police chief at the center of a growing storm in the United States over the fatal shooting of an unarmed black teenager by a white ... more 

Supporters of Trayvon Martin march in New York City on March 21. The police chief at the center of a growing storm in the United States over the fatal shooting of an unarmed black teenager by a white crime watch volunteer stepped down temporarily Thursday less