Casey Johnson's death was caused by a lack of insulin and sky-high blood sugar related to the socialite's advanced diabetes, the Los Angeles County coroner announced Thursday.

The Johnson & Johnson heiress had a condition called diabetic ketoacidosis. The autopsy took place on Jan 5., a day after her body was found in her Los Angeles home.

The 30-year-old daughter of New York Jets owner Robert "Woody" Johnson lived a party life. In December, she announced her engagement to bisexual reality TV star Tila Tequila, who became increasingly outspoken following Johnson's death. Surprisingly, she has not commented on the coroner's report yet on her Twitter feed.