The alleged shooter in the Family Research Council shooting has been indicted.
Floyd Corkins II was indicted by a federal grand jury Wednesday on federal charges of transporting a firearm and ammunition across state lines. He is also charged with assault with the intent to kill.
He is scheduled to be arraigned on Friday. .
Corkins, whose parents said he strongly supported gay rights, had a backpack full of Chick-fil-A sandwiches and a box of ammunition when he said words to the effect of "I don't like your politics" and shot a staffer at the Family Research Council, authorities said.
The staffer, who was working as a guard at the time of the shooting, was shot in the left arm but nonetheless managed to help take down the gunman, preventing what the police said could have been a deadly attack.
It wasn't immediately clear why Corkins, 28, had the chicken sandwiches.
The Family Research Council has steadfastly supported the president of Chick-Fil-A and his staunch opposition to same-sex marriage, a stance that has placed the fast-food chain at the center of a hot-button national cultural debate.
The organization strongly opposes gay marriage and abortion and says it advocates "faith, family and freedom in public policy and public opinion." The conservative group maintains a powerful lobbying presence, testifying before Congress and reviewing legislation.
Corkins had recently been volunteering at a D.C. community center for lesbian, gay, bisexual and transgender people. He lived with his parents in Herndon, Va.
Corkins attended George Mason University in Fairfax, Va., between 2005 and 2007 as part of the College of Humanities and Social Sciences but did not graduate. He earlier attended Grace Brethren Christian School near Andrews Air Force Base outside Washington.
The shooting was condemned by President Barack Obama and Republican presidential candidate Mitt Romney, as well as gay and lesbian advocacy groups and conservative organizations. But there was no swift sign of reconciliation across the ideological spectrum.
The Associated Press contributed to this story.