LOS ANGELES -- The Los Angeles Coroner's office says Casey Johnson's cause of death was related to diabetes.
The Johnson & Johnson heiress, who died Jan. 5 at the age of
30, succumbed to diabetic ketoacidosis, it said, describing it as a natural
Diabetic ketoacidosis is a
life-threatening condition caused by lack of insulin and sky-high
The full autopsy reports will be available in about two weeks, according
to the coroner's office.
An unidentified woman who called 911 the night Johnson died described the heiress as "ice cold," and said her hands were turning blue.
The woman also said there were two other people at the home, and that they all thought Johnson was dead.
Los Angles police and firefighters were called to the home in the 900 block of Orlando Avenue, just off Melrose Avenue, and Johnson was pronounced dead at the scene.
A preliminary investigation turned up no signs of foul play, indicating Johnson's death may have been from natural causes, according to LAPD Officer Sarah Faden.
Faden said she did not know how long Johnson may have been dead by the time authorities arrived.
Johnson had been an insulin-dependent diabetic since childhood.
A memorial fund in her name was set up with the Juvenile Diabetes Research Foundation.
Johnson, dubbed the "baby-oil heiress" by the New York Post, lived her life on the tabloid pages.
She partied with high school friend and fellow heiress Paris Hilton and announced last month that she was "engaged" to bisexual reality TV star Tila Tequila.
Johnson was charged last month with burglary and receiving stolen property for allegedly taking $22,000 in clothing, jewelry and other items from a friend's home.
She pleaded not guilty and faced a February hearing.
She is survived by her parents, two younger sisters, and an adopted child from Kazakhstan she named Ava-Monroe, after her idol, Marilyn Monroe.
She had lost custody of the girl, who was most recently reported in the care of Johnson's mother.
A private funeral was held in New Jersey last month for the Johnson & Johnson heiress.
Johnson's father and New York Jets owner Robert "Woody" Johnson and close friend Nicky Hilton were among those in attendance, CNN reported. Her purported fiancee Tila Tequila did not attend the service.