December 13, 2012 -- Updated 2254 GMT (0654 HKT) NEW: Rivera had left a letter for her loved ones Her remains will be cremated, funeral home employees say The private jet crashed in a mountainous area 9,000 feet above sea level. The medical examiner's office in Monterrey compared DNA samples from the remains to a swab taken from the singer's brother, Lupillo. Employees at a funeral home in Monterrey said they will receive the singer's remains, which will be cremated and placed in an ornate red urn. Family friends said that funeral plans had not been finalized but that a memorial would probably be held in Mexico before the ashes are taken to Los Angeles. Two lawsuits against the company that owns the jet accuse the firm of lying about its links to a businessman convicted of falsifying maintenance records. Rivera had left a letter for her loved ones and gave instructions to her sister Rosie regarding the circumstances under which it should be read, her brother Pedro Jr. told CNN en Espanol on Wednesday. "Jenni always had advisers who helped her to work and to make things right," he said. She prepared a letter about a month, month and a half ago, and Rosie has that letter. Because Jenni, a smart woman, the decisions she made were always based on what she felt in her heart, and she left Rosie in charge of all that. The accident report will not be ready for nine months to a year, the secretary of communications and transportation said. Rivera, 43, is mourned by millions of fans. Known as "La Diva de la Banda" or the Diva of Banda Music, Rivera was a musical powerhouse with her Spanish-language performances of regional Mexican corridos, or ballads. For fans, the nickname captured her powerful voice and personal strength. Rivera sold 15 million records, according to Billboard, and had recently won two Billboard Music Awards, including favorite Mexican music female artist.