PHOENIX – The company that owns a luxury jet that crashed and killed Latin music star Jenni Rivera is under investigation by the U.S. Drug Enforcement Administration, and the agency seized two of its planes earlier this year as part of the ongoing probe.

DEA spokeswoman Lisa Webb Johnson confirmed Thursday the planes owned by Las Vegas-based Starwood Management were seized in Texas and Arizona, but she declined to discuss details of the case. The agency also has subpoenaed all the company's records, including any correspondence it has had with a former Tijuana mayor who U.S. law enforcement officials have long suspected has ties to organized crime.

The man widely believed to be behind the aviation company is an ex-convict named Christian Esquino, 50, who has a long and checkered legal past. Corporate records list his sister-in-law as the company's only officer, but insurance companies that cover some of the firm's planes say in court documents that the woman is merely a front and that Esquino is the one in charge.