MONTERREY, Mexico — 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.

"My son Lupillo told me that effectively it was Jenni's plane that crashed and that everyone on board died," her father, Pedro Rivera, told dozens of reporters gathered in front of his Los Angeles-area home. "I believe my daughter's body is unrecognizable."