"I wasn't terribly attached to the purse," Littleton told CNN. "So anything I could [do] to extend the purse to the lives of other people was a good idea."
Duke then opened fire, but nobody was hit. Security officer Mike Jones wounded Duke, who then fatally shot himself. He was the only casualty of the violence, which was caught on videotape.
"I knew something bad was going to happen. I could leave and try to live with myself if it did, or go back and try to at least delay or divert until we could get some help," Littleton told "The Early Show" on CBS last week.
An unidentified man in Alexandria, Va., submitted the winning bid for the bag, according to WJHG-TV, which organized the acution and will donate the same amount as the bid to the charity.
The proceeds from the sale of Littleton's faux crocodile leather purse will go to Salvage Santa, a charity started by Jones that restores old bicycles and toys for children.
"I thought, 'Wow, what closure for everyone. This was a way to tie everything up,'" Littleton told CNN.