The couple joined the teenager's mother Sybrina Fulton at the event in Manhattan, one week after George Zimmerman was acquitted of shooting Trayvon in the Florida housing community where the youngster's father's fiancee lived as he returned from the local store in 2012.
Zimmerman has claimed he shot Trayvon in self-defence.
Speaking at the rally, Trayvon's mother said: ''George Zimmerman started the fight and George Zimmerman ended the fight. My son died without even knowing who his killer was ... Today it was my son. Tomorrow it might be yours.
''Trayvon was no burglar. He had a drink and some candy. He had every right to be in that area.''
Meanwhile, Jay Z and Justin Timberlake dedicated the song 'Forever Young' to the 17-year-old shooting victim at their concert at New York's Yankee Stadium on Friday (19.07.13).
The pair - who are currently on their 'Legends of the Summer' tour - closed the show with the emotional number while Jay Z asked the audience to remember Trayvon.
He said: ''Everybody put a cell phone and light it up ... let's light the sky for Trayvon Martin tonight in here.''
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