Mexico's music world mourned Jenni Rivera, the U.S.-born singer presumed killed in a plane crash whose soulful voice and openness about her personal troubles had made her a Mexican-American superstar. Authorities have not confirmed her death, but Rivera's relatives in the U.S. say they have few doubts that she was on the Learjet 25 that disintegrated on impact Sunday in rugged territory in Nuevo Leon state in northern Mexico. (Information from the Associated Press, Photos from Getty Images)