SANFORD, Fla. -

More than 750,000 people have signed an online petition started by the parents of Trayvon Martin, who was shot and killed in Sanford by a neighborhood watch leader.

The change.org petition has attracted celebrities like Cher, Chad Ochocinco and Michael Moore, who have tweeted their support for the Martin family.

The online attention is garnering the support of more musicians, professional athletes, film industry representatives and numerous other celebrities online, all of whom are calling for justice in this death investigation.

Martin's parents, Tracy Martin and Sybrina Fulton, have called on Florida District Attorney Norman Wolfinger to bring charges against George Zimmerman, who Sanford police say shot and killed the17-year-old in self-defense.

A number of international celebrities have also taken to Twitter and Facebook to spread the word about the petition.

Musicians Wyclef Jean, Talib Kweli, Clay Aiken, Monica, Janelle Monae, and Raheem Devaughn; film leaders, including Spike Lee, Mia Farrow, Taraji P. Henson and D. L. Hughley have all tweeted their support.

Martin was shot and killed while walking from a store where he had just purchased a bag of Skittles and an iced tea for his younger step-brother. According to reports, Zimmerman called police to report a suspicious person after he saw Martin walking back from the store.

Despite police instructing him not to confront Martin, an altercation ensued.  Witnesses say there was a scuffle before Zimmerman fired a shot, striking the teen in the chest.

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