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Johnson & Johnson heiress Casey Johnson, ex-girlfriend of Courtenay Semel and fiancee of Tila Tequila, has passed away.

Johnson is survived by her daughter - Ava Monroe Johnson - whom she adopted from Kazakhstan in 2007 and by her parents, New York Jets owner Woody Johnson and socialite Sale Johnson.

Casey was diabetic and known to carry around prescription meds with her but recently, there were accusations that Johnson was becoming erratic and perhaps taking more than just her diabetes treatment. Her parents had taken Ava to New York to care for her because they felt the 30 year-old wasn't able to perform regular parental duties and the Johnson family threatened to cut Casey off -- financially.

Eonline reports Casey's maid came screaming out of the heiress' home yesterday, "She's dead!"

Police say Johnson was dead upon arrival at 11:50 am this morning. Officer Sara Faden of the LAPD said the death appears to be natural, with no signs of foul play. The coroner's office will be preforming an investigation and conduction toxicology tests.

Johnson and Tequila (nee Tila Nguyen) announced their engagement on Dec 9, just days after Johnson was arrested for allegedly stealing jewelry, shoes, legal documents, clothing and underwear from former friend, British model socialite Jasmine Lennard. Casey's ex, Courtenay Semel, turned her in.

Tila Tequila, who referred to Johnson as her "wife", posted the unfortunate news just minutes ago on Twitter:

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UPDATE: Tila now says Casey isn't dead, but in a coma. "I just got news that my fiance is not dead but currently in a coma!!! Omg please pray that she will make it! Hang in there my love please!!!" she tweeted. Tequila added minutes later, "I know u can feel me Casey! Dot let go! I'm almost home baby please hang on! We have a beautiful life planned out for us! I LOVE u! Hang on!"

UPDATE 2: Tila now says she was "in shock." "R.I.P my Angel @caseyjonsonJnJ," she tweeted after declaring Casey was "in a coma". "u will forever be in my heart! I love u so so much and we will Marry when I see U in Heaven my Wifey."

Casey's last Tweet was on Dec. 29 and read, "Sweet Dreams Everyone."