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Casey Johnson arrives at the grand opening of Apple Lounge in West Hollywood, California, in this August 2008 file photo. Image Credit: AP

Los Angeles: A spokesman for the family of New York Jets owner Woody Johnson says a daughter of the businessman has died.

30-years-old Casey Johnson is an heiress to the Johnson & Johnson fortune.

Spokesman Jesse Derris said Monday that the family is mourning the tragic loss of Casey Johnson. In a statement, the family asked for privacy "during this very difficult time."

Derris wouldn't say how or when Johnson died. TMZ.com reported that Johnson was found dead Monday in Los Angeles.

Casey Johnson gained celebrity as the girlfriend of Tila Tequila, a reality TV star best known for "A Shot at Love with Tila Tequila," which ran for two seasons on MTV.

Tequila's publicist says the two were engaged.