Casey Johnson, the Johnson and Johnson heiress who had a well-known drug abuse problem, could have died from not taking her diabetes medication, according to police.
Johnson was diagnosed with diabetes as a child and had worked with the Juvenile Diabetes Foundation.
In a 2000 interview with the New York Observer, Casey said that she gave herself insulin shots every day.
"She was still suffering from diabetes and she was still on diabetic medications," People quoted a police source with knowledge of the situation as saying.
"The speculation is she came home after a night of partying and passed out without taking her meds or her insulin and that was the end of her," added the insider.
Police has said that there was no sign of foul play and there were no obvious signs that Johnson, 30, took any illicit drugs before her death.
An autopsy was imminent, although a conclusive report might take several weeks pending the results of toxicology tests.
The source also said that Johnson has had some wild ups and downs in her life over the past few months.
She had become engaged last month to reality star Tila Tequila and about five weeks ago, she was arrested on suspicion of grand theft for allegedly stealing from a fellow Hollywood party girl.
Johnson, who leaves behind an adopted toddler daughter Ava, was the great-great granddaughter of the founder of the pharmaceutical giant, and the daughter of New York Jets owner Robert Wood Johnson.