Johnson & Johnson Heiress Casey Johnson has died

Wonderwall, Monday, January 4, 2010, 5:56pm (PST)

TMZ is reporting that Casey Johnson, the 30-year-old heiress to the Johnson & Johnson fortune, was found dead this morning in Los Angeles. The cause of death is currently unknown.

RELATED: See more photos of Casey

She was recently in the news after a reported engagement to reality star Tila Tequila. Tila showed off the engagement ring at an event on Dec. 9.

Her father is Woody Johnson, who owns the New York Jets. Johnson adopted a baby girl from Kazakhstan in 2007 and named her Ava-Monroe after Marilyn Monroe, Casey's reported idol.

RELATED: See photos of Tila Tequila

The heiress had been known to be a party girl, friends with Paris Hilton and Lindsay Lohan. And she was no stranger to trouble. In November, she was arrested for grand theft -- the victim being a former girlfriend.

TMZ spoke with Tequila, who said she and Casey had been fighting and Casey last stayed over at her house on Dec. 28. She also said Johnson's phone had been shut off since Dec. 29, the same day Johnson tweeted for the last time. Her last status update on Facebook on Dec. 29th was, "Sweet Dreams Everyone."

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Tequila tweeted , "Everyone please pray 4 my Wifey Casey Johnson. She has passed away. Thank u for all ur love and support but I will be offline to be w family."

Story developing.