Shields then followed that up with victories at the 2014 World Championships and 2015 Pan American Games .
Shields is the first American woman to win a boxing gold medal with middleweight honours at London 2012 .
Shields , the first American woman to win a boxing gold medal with middleweight honours at London 2012 , then followed that up with victories at the 2014 World Championships and 2015 Pan American Games .