Cesar Millan, the former star of The National Geographic Channel's "Dog Whisperer," sits down with Rock Center's Kate Snow to discuss attempting suicide and how he was able to find a purpose again. As a child growing up in Mexico, Millan says he dreamed of becoming the world's top dog trainer. At 21, he illegally jumped the border into the United States and what started with dog walking eventually turned into a thriving T.V. career. However, despite his fame and fortune, Millan almost threw it all away by taking "a whole bunch of pills." Watch Kate Snow's full report, "Top Dog," Friday, June 14 at 10pm/9c on NBC's Rock Center with Brian Williams.