Singer 's plane was flying at 28,000 feet when it began to plummet , official says . It could have plunged at more than 600 mph , the transportation secretary says . Determining what caused the crash in northern Mexico could take up to a year . Comment: In recent years , she had been working to crack the English-language U.S. market and was reportedly on the verge of a crossover with a sitcom inspired by the success of `` I Love Jenni , '' a Spanish-language reality TV show on Telemundo 's mun2 network . The pilot lost control of his airplane and crashed into mountains near the town of San Luis Potosi, about 100 miles from where he lived.
Singer 's plane was flying at 28,000 feet when it began to plummet , official says . It could have plunged at more than 600 mph , the transportation secretary says . Determining what caused the crash in northern Mexico could take up to a year . Comment: The pilot lost control of his airplane and crashed into mountains near the town of San Luis Potosi, about 100 miles from where he lived.