CHICAGO, Ill. -

The parents of slain Florida teenager Trayvon Martin say there must be an end to "senseless gun violence."

The Chicago Sun-Times reports that they spoke publicly Saturday in Chicago with the Rev. Jesse Jackson and family members of murder victims in the Chicago area.

Martin's mother Sybrina Fulton says since Martin can't speak for himself, she has to help the community and other parents. She has spoken recently at a Maryland church and has started the Justice for Trayvon Foundation.

The February shooting of the unarmed 17-year-old old sparked a national outcry.

Neighborhood watch volunteer George Zimmerman has been charged with second-degree murder and was released on bond. He says he shot Martin in self-defense.