The company that owns the luxury jet that Mexican popstar Jenni Rivera flew to her death in is under investigation by the U.S. Drug Enforcement Administration. The agency previously seized two of its aircrafts in Texas and Arizona earlier this year amid an ongoing probe.

Lisa Webb Johnson, a spokesperson for the DEA, confirmed on Tuesday that the airplanes are owned by Starwood Management, a company that is based in Las Vegas. However, she declined to comment on the details of the case.

Starwood Management's records have also been subpoenaed by the agency, which includes any correspondence it has had with a former Tijuana mayor who U.S. law enforcement officials suspected of having ties to organized crime.

Christian Esquino, who is an ex-convict with a checkered past, is strongly believed to be behind the aviation company, but corporate records list the 50-year-old's sister-in-law as being its sole officer. However, insurance companies that cover some of the company's planes claim that the woman is a front while Esquino remains in charge.

Esquino has legal troubles that go back decades. He pled guilty to a fraud charge associated with a major drug investigation in Florida early in the 90s. Esquino had also been sentenced to two years in federal prison for being involved in a California aviation fraud case, but was deported upon his release.

The Mexican citizen, along with many other companies he's associated with have been sued for not paying millions of dollars in loans, according to court records.

The 43-year-old Rivera died on early Sunday morning when the plane she was riding on nose-dived into the ground while she was making the trip from Monterrey to Toluca in Mexico.

Rivera was arguably the most successful musician in grupero, which is a male-dominated Mexico regional style. She had also ventured into acting and reality television.

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Jenni rivera, Offbeat