New York Times columnist Nick Kristof has been a frequent guest on "Piers Morgan Tonight," discussing the Arab Spring. He's back on the show tonight to put the death of Moammer Gadhafi into perspective. "This is a huge milestone," he tells Piers Morgan. "This is going to end the opposition to the new Libyan government."
Kristof noted just how monumental this year has been in the region. "At the beginning of this year it would have been inconceivable what happened," he says. Watch the full show tonight, 9pmET, for all the latest news and reaction to the death of Gadhafi.