She reminds people of her loss in a video message released Friday and asks them to voice opposition to Florida's controversial "stand your ground" law, and similar laws adopted in more than 20 states.
"Nobody can bring our children back," she said, calling on supporters to ask their respective governors to re-examine laws that set the terms of self-defense and the use of deadly force.
"But it would bring us comfort if we can help spare other mothers the pain we will feel on mother's day and every day for the rest of our lives."
Martin, 17, was shot to death as he was walking home from a convenience store in Sanford, Florida. George Zimmerman, a neighborhood watch volunteer, has said he shot Martin in self-defense.
While details of the February 26 shooting are murky, the case has since sparked outcry and thrust issues of race and gun control into the national dialogue.
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