New details deepen Trayvon Martin controversy (CBS News) SANFORD, Fla. - New information is putting a new twist on the Trayvon Martin case. It has come out that the unarmed teenager was suspended from school, and is accused of beating up the man who then shot him dead. Martin's parents claim authorities are now trying to sully their son's reputation, after his tragic shooting. There were several protests Monday in Sanford, where Martin, 17, was shot by George Zimmerman. State and federal investigators were to be back at it Tuesday, reviewing the original controversial police investigation that's sparked a firestorm. The central questions remains: Was the decision not to arrest Zimmerman the right one, and should he be arrested now? Chanting "no justice, no peace," demonstrators marched through downtown Sanford and presented city commissioners with petitions, signed by 2 million people, demanding Zimmerman's arrest. The crime watch captain says he shot Martin in self-defense, but the teen's father, Tracy Martin, wants Zimmerman in jail. "We're not asking for an eye for an eye," he told one crowd. We're asking for justice, justice, justice! Martin's parents also found themselves on the defensive for the first time since the shooting. Revelations surfaced that the teen's high school had suspended him three times for offenses including vandalism, truancy and tardiness, and, at the time of his death, he was in the midst a two-week suspension for a baggie containing marijuana residue found in his book bag. The family reacted angrily, accusing Sanford police of maligning their son. His mother, Sybrina Fulton, said, "They've killed my son, and now they're trying to kill his reputation." Sanford police have confirmed that investigators believe Martin decked Zimmerman with a single punch and bashed his head against the sidewalk. Zimmerman then fired his nine millimeter. But Trayvon's killing has launched waves of protest. In Los Angeles, several hundred people, many wearing hoodies, as Trayvon was when he was shot, marched during rush hour demanding answers. State and federal authorities, including Florida State Attorney General Pam Bondi, say their review will take time, and pleaded for patience. "What we do know," said Bondi, "is a 17 year-old boy was walking home and now he's dead. And when you have questions like that, they need to be answered. Trayvon's parents were to leave for Washington Tuesday and a congressional hearing. Its focus: neighborhood watch groups, racial profiling, and Florida's "Stand Your Ground" law - the one Zimmerman apparently felt gave him the right to shoot Trayvon in what he claims was self-defense. To see Mark Strassmann's report, click on the video in the player above.