Previously invulnerable in the fight ring. Undefeated in 18 bouts. Champion. Rhonda Rousey had it all, until Holly Holm knocked her out in late 2015, not only stealing her crown but her identity: "I was sitting in my corner and was like, 'What am I if I'm not this? I was literally thinking about killing myself...I'm nothing. What do I do anymore and no one gives a (rip) about me anymore without this.'" Rousey yields a great example of ...