Photos and flowers honoring late singer Jenni Rivera, placed by fans next to religious images, are seen at the cemetery where her mother is buried in Hermosillo, northern Mexico, Monday, Dec. 10, 2012. U.S. authorities confirmed Monday that Rivera, a U.S.-born singer whose soulful voice and openness about her personal troubles made her a Mexican-American superstar, was killed in a plane crash early Sunday in northern Mexico. (AP Photo/Baldemar De Los Llanos)
A rescue helicopter with members of the Mexican General Civil Aeronautic Directorate (DGAC) stand on top of the hill right next to the canyon where U.S.-born singer Jenni Rivera's jet crashed near the town of Iturbude, Mexico, Dec. 10, 2012. Rivera's life was cut short at its peak on Sunday by an airplane crash in northern Mexico that also killed six friends and co-workers. (AP Photo/Hans Maximo Musielik)
Photos and flowers honoring late singer Jenni Rivera, placed by fans next to religious images, are seen at the cemetery where her mother is buried in Hermosillo, northern Mexico, Monday, Dec. 10, 2012. U.S. authorities confirmed Monday that Rivera, a U.S.-born singer whose soulful voice and openness about her personal troubles made her a Mexican-American superstar, was killed in a plane crash early Sunday in northern Mexico. (AP Photo/Baldemar De Los Llanos)
In this photo released Monday, Dec. 10, 2012, by Indomina Media, shows singer and actress Jenni Rivera during the filming of her upcoming movie "Filly Brown." The film "Filly Brown" is expected to be released on the Spring of 2013. Rivera's life was cut short at its peak on Sunday by an airplane crash in northern Mexico that also killed six friends and co-workers. (AP Photo/Indomina Media)
Video cameras and flags used by the forensic experts are unloaded from a helicopter on top of the hill next to the canyon where an airplane crash occurred a day earlier claiming the life of U.S.-born singer Jenni Rivera near the town of Iturbude, Mexico, Monday Dec. 10, 2012. Rivera's life was cut short at its peak on Sunday by an airplane crash in northern Mexico that also killed six friends and co-workers. (AP Photo/Hans Maximo Musielik)
Media gather outside the home of singer Jenni Rivera's mother in Lakewood, Calif. Monday, Dec. 10, 2012. Rivera died Sunday in a plane crash in Mexico. U.S. authorities confirmed Monday that Jenni Rivera, a U.S.-born singer whose soulful voice and openness about her personal troubles made her a Mexican-American superstar, was killed Sunday in a plane crash in northern Mexico. (AP Photo/Jason Redmond)
A fan lights a candle outside the home of singer Jenni Rivera's mother in Lakewood, Calif. Monday, Dec. 10, 2012. Rivera died Sunday in a plane crash in Mexico. U.S. authorities confirmed Monday that Jenni Rivera, a U.S.-born singer whose soulful voice and openness about her personal troubles made her a Mexican-American superstar, was killed Sunday in a plane crash in northern Mexico. (AP Photo/Jason Redmond)
Fans leave photos and flowers at a makeshift shrine for singer Jenni Rivera at Plaza Mexico in Lynwood, Calif. Monday, Dec. 10, 2012. U.S. authorities confirmed Monday that Jenni Rivera, a U.S.-born singer whose soulful voice and openness about her personal troubles made her a Mexican-American superstar, was killed Sunday in a plane crash in northern Mexico. (AP Photo/Jason Redmond)
Fan Briza Jimenez takes a photo of a makeshift shrine for singer Jenni Rivera at Plaza Mexico in Lynwood, Calif. Monday, Dec. 10, 2012. U.S. authorities confirmed Monday that Jenni Rivera, a U.S.-born singer whose soulful voice and openness about her personal troubles made her a Mexican-American superstar, was killed Sunday in a plane crash in northern Mexico. (AP Photo/Jason Redmond)
Singer Jenni Rivera is seen on a video screen, top, at a music store in Mexico City, Monday, Dec. 10, 2012. U.S. authorities confirmed Monday that Rivera, a U.S.-born singer whose soulful voice and openness about her personal troubles made her a Mexican-American superstar, was killed in a plane crash early Sunday in northern Mexico. (AP Photo/Eduardo Verdugo)
A person takes a CD of singer Jenni Rivera displayed for sale at a music store in Mexico City, Monday, Dec. 10, 2012. U.S. authorities confirmed Monday that Rivera, a U.S.-born singer whose soulful voice and openness about her personal troubles made her a Mexican-American superstar, was killed in a plane crash early Sunday in northern Mexico. (AP Photo/Eduardo Verdugo)
LOS ANGELES — Tearful fans set up candlelight shrines and memorials to Jenni Rivera from California to Mexico, as investigators said it would take days to piece together the wreckage of the plane carrying the Mexican-American music superstar and find out why it went down. …