"This is where it matters," she said as she and a friend prepared to run.
O'Dell, who walked the race course, called the experience bittersweet.
"We're celebrating their lives, but remembering, too," he said. "It's difficult, but I think it's important."
Also Thursday, the last two victims' families who hadn't agreed to an $11 million settlement sued the state over the killings.
David Clementson, a spokesman for Virginia Attorney General Bill Mims, confirmed the families of slain students Julie Pryde and Erin Peterson filed lawsuits in Fairfax County Circuit Court just before the statute of limitations expired. He could not provide details.
Though most families accepted the settlements and agreed not to sue, some remain critical of school officials' actions the day of the shootings. Virginia Tech spokesman Larry Hincker said he was aware of the lawsuits but also had no details. Messages were left for the families.
On campus, Carney and O'Dell were joined by many of the other students injured that day, memories of the shootings still clear in their minds.
Engineering student Fred Cook jumped out a second-story window in Norris Hall as his professor, Liviu Librescu, was gunned down while he barred Cho from entering his classroom. Cook hurt his ankle, but took up running when he recovered and participated in Thursday's race.
"Not a day goes by that we don't think about it," Cook said. "This increased sense of awareness by everyone certainly makes it more acute for us."
Most of the 12 injured students still on campus joined about 4,300 people who raced around the main section of campus on the bright, sunny morning. The event began with the release of balloons - 32 white, followed by hundreds in the school colors of maroon and orange - and chants of "Let's Go, Hokies."
The mood was upbeat as students crowded around a table to sign a message banner before the race.
Suzanne Grimes, whose son Kevin Sterne was injured, was impressed that nearly all of the runners were students, some of whom weren't on campus two years ago.
"They came out and showed their respect," she said. More than 2,000 people gathered later for a more somber event to remember the accomplishments of the 27 students and five faculty members killed.
"While the tragedy of April 16, 2007, touched us all, we know that 32 families continue to confront the deepest of all losses - the loss of a loved one, the loss of a life well-lived, and the loss of a bright and promising future," university President Charles Steger told the crowd.
Five of the injured students read passages during the ceremony. One, Colin Goddard, read an old Celtic prayer that said in part: "Be gentle as you walk with grief."
"This is extremely, extremely sad," said Holly Sherman, whose daughter Leslie Sherman was killed.
But she said it was helpful to see other family members again. "We're sharing some feelings," she said. "There are benefits to having a day like this."
About 100 relatives of victims and injured students returned for the memorial ceremonies - a few more than last year, according to Debbie Day, head of the school's Office of Recovery and Support. Many still find it too painful to return, said Joseph Samaha, whose daughter Reema Samaha died.
Classes were canceled, but the response to the "3.2 for 32" race was so great that the school also delayed opening offices until midmorning to avoid traffic jams.
Jerzy Nowak, director of a new peace center that occupies the refurbished classroom wing where most of the victims died, greeted a steady stream of visitors at an afternoon open house. Some students threw Frisbees or lounged on the main lawn, but hundreds attended a dance performance in memory of Reema Samaha. The final event was a candlelight vigil at dusk.
Geraldine Adams, Leslie Sherman's grandmother, came from Kennewick, Wash., and found the experience healing.
"I'm so in awe of Virginia Tech," she said. "I saw all these people with pain on their faces. It fills you with humility."
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