Protesters in the Bronx linked Martin's case to a local one.
They're still demanding answers about why unarmed black teen Ramarley Graham was killed by police there last month.
In Jersey City, protesters wore hoodies and carried Skittles as Martin did the night he was shot as they called for justice.
Meanwhile, for the first time, the brother of George Zimmerman, the man who killed Trayvon Martin, spoke out.
Robert Zimmerman says his family has gotten credible death threats and he fears for his own life.
Get Eyewitness News Delivered