Casey Johnson

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Casey Johnson struggled all her life with diabetes, and in the end, the disease claimed her life.

The Los Angeles County coroner just announced that heiress's death was caused by diabetic ketoacidosis, a condition caused when a diabetic does not have enough insulin in her system.

Her death was deemed natural, and not due to drugs or even suicide, as some speculated.

Officials say a detailed report on her death will be released within the next two weeks.

Johnson, 30, was found dead in her rental home in L.A. on Jan. 4; she was laid to rest in her native New Jersey eight days later.