Report: Detective wanted Zimmerman charged Several thousand students from historically black universities join local residents, some wearing hoodies, as they hold hands in solidarity at a rally for slain youth Trayvon Martin in front of the state Capitol in Atlanta on March 26, 2012. A Capitol policeman said it was the largest rally in recent memory and several downtown streets were closed down, snarling the evening rush hour. SANFORD, Fla., March 27 (UPI) -- Florida prosecutors overruled a police detective's recommendation to charge George Zimmerman with manslaughter in the death Trayvon Martin, ABC News reported. Chris Serino, the lead homicide detective on the case, recommended charging Zimmerman the night the neighborhood watch volunteer shot and killed Martin, an unarmed teenager, in a gated community in Sanford, Fla., ABC reported Tuesday, citing sources it did not name. The network said Serino was instructed not to charge Zimmerman after the office of Brevard and Seminole county prosecutor Norman Wolfinger concluded there was insufficient evidence to prosecute the case. Wolfinger's office said it had no comment on the report. Zimmerman's attorney told ABC News his client was questioned for a few hours at a police station following the Feb. 26 shooting. Martin's parents, Tracy Martin and Sybrina Fulton, spoke Tuesday in Washington at a meeting of Democratic members of the House Judiciary Committee, billed as a briefing on racial profiling and hate crimes, The Miami Herald reported. In brief remarks, Tracy Martin said the family "will continue to fight for justice" for Trayvon Martin and Fulton expressed thanks for support the family has been receiving. "As I've said before and I'll say again, Trayvon is our son, but Trayvon is your son," she said. Rep. John Conyers, D-Mich., conducted the session, in which no Republicans participated, the Herald said. "Today is not to examine the specific facts of the case," Conyers said. That will be left to the Department of Justice and the state investigation that is under way. Our job is to understand the legislative and legal concepts that exist to consider what can be done to prevent similar tragedies from happening again. Sanford has a duty to ensure Zimmerman is arrested, the Rev. Jesse Jackson said Monday. "The whole world is watching Sanford," the civil rights activist said as he appeared with other civil rights leaders and Martin's parents at a City Commission meeting that was moved to the Sanford Civic Center from City Hall because of the large number of attendees. The Rev. Al Sharpton -- a civil rights activist and MSNBC political commentator -- delivered a petition he said had 2 million signatures demanding the arrest of Zimmerman. Zimmerman, 28, who is white, admitted shooting Martin, who is black, but said the 17-year-old had punched him and then repeatedly slammed his head into the sidewalk in the moments leading up to the shooting, police told the Orlando Sentinel, giving the most thorough details yet of Zimmerman's account. "They have killed my son," Fulton said tearfully. It was reported Martin had been suspended from his Miami high school more than once, the last time after school officials found in his book bag a plastic bag with traces of marijuana residue inside. "What he was suspended for has no bearing on what happened on Feb. 26," said Benjamin Crump, a lawyer representing the Martin family.